no monotone for macOS anymore

(Homebrew/homebrew-core#26778)

Author: Vladimir Kotal

.travis.yml

@@ -15,7 +15,7 @@ before_install:
  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install -qq exuberant-ctags cvs git mercurial cssc bzr subversion monotone rcs pep8; fi
  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo ./scripts/install-bitkeeper.sh; fi
  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; fi
- - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install ctags cvs monotone; fi
+ - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install ctags cvs; fi
  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then pip install pep8; fi
 install: true