Update README.md
Update README.md
Added boolean combinators (IsTrue/IsFalse) and associated DSL per issue #5
Merge pull request #8 from wix/booleans

Added boolean combinators (IsTrue/IsFalse) and associated DSL per issue #5
Merge branch 'master' into descriptions

Conflicts:
	core/src/main/scala/com/wix/accord/combinators/BooleanCombinators.scala
	core/src/test/scala/com/wix/accord/tests/combinators/BooleanCombinatorTests.scala