Replace io/ioutil package

[zeek0x]

"io/ioutil" package has been deprecated since Go 1.16.

This does not indicate that the package will be broken in the future, but analysis tools such as staticcheck will recognize it as a target for modification, thus burying the analysis to be fixed.

$ git --no-pager grep ioutil
$

staticcheck-before

echo.go:46:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
echo_test.go:10:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
group_test.go:4:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/body_dump.go:7:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/body_dump_test.go:5:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/body_limit_test.go:5:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/compress.go:7:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/compress_test.go:7:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/decompress_test.go:7:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/jwt.go:265:2: this value of token is never used (SA4006)
middleware/proxy_test.go:7:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/proxy_test.go:387:2: this value of rec is never used (SA4006)
middleware/rewrite_test.go:4:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/timeout_test.go:8:2: "io/ioutil" has been deprecated since Go 1.16: As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code. See the specific function documentation for details.  (SA1019)
middleware/timeout_test.go:132:34: should use make(chan struct{}) instead (S1019)
middleware/timeout_test.go:248:34: should use make(chan struct{}) instead (S1019)
middleware/timeout_test.go:278:34: should use make(chan struct{}) instead (S1019)

staticcheck-after

middleware/jwt.go:265:2: this value of token is never used (SA4006)
middleware/proxy_test.go:387:2: this value of rec is never used (SA4006)
middleware/timeout_test.go:132:34: should use make(chan struct{}) instead (S1019)
middleware/timeout_test.go:248:34: should use make(chan struct{}) instead (S1019)
middleware/timeout_test.go:278:34: should use make(chan struct{}) instead (S1019)

[codecov]

Codecov Report

Base: 92.37% // Head: 92.38% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (506924f) compared to base (fd2b102).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2342      +/-   ##
==========================================
+ Coverage   92.37%   92.38%   +0.01%     
==========================================
  Files          37       37              
  Lines        4448     4454       +6     
==========================================
+ Hits         4109     4115       +6     
  Misses        247      247              
  Partials       92       92              

Impacted Files	Coverage Δ
echo.go	95.24% <100.00%> (+0.06%)	⬆️
middleware/body_dump.go	90.47% <100.00%> (ø)
middleware/compress.go	81.15% <100.00%> (ø)

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[aldas]

Thank you