Bump version to 0.2.1

Version 0.2.0

Merge pull request #34 from machinio/sort-by-function

Sort by function

Version 0.1.7

Return back internal notifications that are used for testing

[instrumentation-fixes] make instrumentation occur (#27)

only once per request and use naming convention suggested by Rails guides

[better-config-error] English: fix excessive possessive usage (#26)

* [better-config-error] English: fix excessive possessive usage

* [better-config-error] New version

Update version to 0.1.3