Update README.md
Support for buildType property runProguard being renamed to isMinifyEnabled in Android Gradle plugin 0.14.0
Merge pull request #25 from NextFaze/support-0.14

Support Android Gradle plugin 0.14.0 (runProguard renamed to isMinifyEnabled)
Merge branch 'master' of https://github.com/testfairy/testfairy-gradle-plugin