Update README.md

README.md

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 # output-formatter
 Annotate/prefix command output.
+
+![Picture](screenshot.png)
+
+# Install
+
+`go get -u github.com/rabbit-ci/output-formatter`
+
+# Usage
+
+```
+output-formatter your command
+```
+
+Disclaimer: arguments passed to output-formatter will be joined into a string and sent to "bash -c". This allows for things like `"echo 'bleh' >&2"` to be run and show up as stderr. This means that `output-formatter echo "Isn't it cool?"` will fail because the `"`'s are removed and it's actually running: `bash -c echo Isn't it cool?`. Fix this by quoting the whole command: `output-formatter "echo \"Isn't it cool?\""`.