Add CHANGELOG.md for historic tracking of changes (#1764)

CHANGELOG.md

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+# Changelog
+
+## v4.2.0 - 2020-02-11
+
+**Important notes**
+
+The behaviour for binding data has been reworked for compatibility with echo before v4.1.11 by
+enforcing `explicit tagging` for processing parameters. This **may break** your code if you 
+expect combined handling of query/path/form params.
+Please see the updated documentation for [request](https://echo.labstack.com/guide/request) and [binding](https://echo.labstack.com/guide/request)
+
+The handling for rewrite rules has been slightly adjusted to expand `*` to a non-greedy `(.*?)` capture group. This is only relevant if multiple asterisks are used in your rules.
+Please see [rewrite](https://echo.labstack.com/middleware/rewrite) and [proxy](https://echo.labstack.com/middleware/proxy) for details.
+
+**Security**
+
+* Fix directory traversal vulnerability for Windows (#1718, little-cui)
+* Fix open redirect vulnerability with trailing slash (#1771,#1775 aldas,GeoffreyFrogeye)
+
+**Enhancements**
+
+* Add Echo#ListenerNetwork as configuration (#1667, pafuent)
+* Add ability to change the status code using response beforeFuncs (#1706, RashadAnsari)
+* Echo server startup to allow data race free access to listener address
+* Binder: Restore pre v4.1.11 behaviour for c.Bind() to use query params only for GET or DELETE methods (#1727, aldas)
+* Binder: Add separate methods to bind only query params, path params or request body (#1681, aldas)
+* Binder: New fluent binder for query/path/form parameter binding (#1717, #1736, aldas)
+* Router: Performance improvements for missed routes (#1689, pafuent)
+* Router: Improve performance for Real-IP detection using IndexByte instead of Split (#1640, imxyb)
+* Middleware: Support real regex rules for rewrite and proxy middleware (#1767)
+* Middleware: New rate limiting middleware (#1724, iambenkay)
+* Middleware: New timeout middleware implementation for go1.13+ (#1743, )
+* Middleware: Allow regex pattern for CORS middleware (#1623, KlotzAndrew)
+* Middleware: Add IgnoreBase parameter to static middleware (#1701, lnenad, iambenkay)
+* Middleware: Add an optional custom function to CORS middleware to validate origin (#1651, curvegrid)
+* Middleware: Support form fields in JWT middleware (#1704, rkfg)
+* Middleware: Use sync.Pool for (de)compress middleware to improve performance (#1699, #1672, pafuent)
+* Middleware: Add decompress middleware to support gzip compressed requests (#1687, arun0009)
+* Middleware: Add ErrJWTInvalid for JWT middleware (#1627, juanbelieni)
+* Middleware: Add SameSite mode for CSRF cookies to support iframes (#1524, pr0head)
+
+**Fixes**
+
+* Fix handling of special trailing slash case for partial prefix (#1741, stffabi)
+* Fix handling of static routes with trailing slash (#1747)
+* Fix Static files route not working (#1671, pwli0755, lammel)
+* Fix use of caret(^) in regex for rewrite middleware (#1588, chotow)
+* Fix Echo#Reverse for Any type routes (#1695, pafuent)
+* Fix Router#Find panic with infinite loop (#1661, pafuent)
+* Fix Router#Find panic fails on Param paths (#1659, pafuent)
+* Fix DefaultHTTPErrorHandler with Debug=true (#1477, lammel)
+* Fix incorrect CORS headers (#1669, ulasakdeniz)
+* Fix proxy middleware rewritePath to use url with updated tests (#1630, arun0009)
+* Fix rewritePath for proxy middleware to use escaped path in (#1628, arun0009)
+* Remove unless defer (#1656, imxyb)
+
+**General**
+
+* New maintainers for Echo: Roland Lammel (@lammel) and Pablo Andres Fuente (@pafuent)
+* Add GitHub action to compare benchmarks (#1702, pafuent)
+* Binding query/path params and form fields to struct only works for explicit tags (#1729,#1734, aldas)
+* Add support for Go 1.15 in CI (#1683, asahasrabuddhe)
+* Add test for request id to remain unchanged if provided (#1719, iambenkay)
+* Refactor echo instance listener access and startup to speed up testing (#1735, aldas)
+* Refactor and improve various tests for binding and routing
+* Run test workflow only for relevant changes (#1637, #1636, pofl)
+* Update .travis.yml (#1662, santosh653)
+* Update README.md with an recents framework benchmark (#1679, pafuent)
+
+This release was made possible by **over 100 commits** from more than **20 contributors**:
+asahasrabuddhe, aldas, AndrewKlotz, arun0009, chotow, curvegrid, iambenkay, imxyb, 
+juanbelieni,  lammel, little-cui, lnenad, pafuent, pofl, pr0head, pwli, RashadAnsari, 
+rkfg, santosh653, segfiner, stffabi, ulasakdeniz