CB-13299 (CI) Fix Android builds

Author: alsorokin

.travis.yml

@@ -63,7 +63,6 @@ matrix:
       components:
       - tools
 before_install:
-- npm cache clean -f
 - rm -rf ~/.nvm && git clone https://github.com/creationix/nvm.git ~/.nvm && (cd ~/.nvm
   && git checkout `git describe --abbrev=0 --tags`) && source ~/.nvm/nvm.sh && nvm
   install $TRAVIS_NODE_VERSION