Fix missing ]
Fix #2: Renamed Function to Callable
Update travis build status badge URL
Merge pull request #33 from vlasovskikh/fix-missing-bracket

Fix missing ] mentioned in #30
Merge pull request #35 from vlasovskikh/function-to-callable

Fix #2: Renamed Function to Callable
Removed duplicated tests
Merge pull request #37 from vlasovskikh/remove-duplicated-tests

Removed duplicated tests