[Travis] try another way of getting the keys

Author: mwarusz

.travis.yml

@@ -59,7 +59,7 @@ before_install:
     #- if [[ $TRAVIS_OS_NAME == 'osx' ]]; then brew cask uninstall oclint; fi
 
     # needed to get rvm, see below
-    - if [[ $TRAVIS_OS_NAME == 'osx' ]]; then gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 7D2BAF1CF37B13E2069D6956105BD0E739499BDB; fi 
+    - if [[ $TRAVIS_OS_NAME == 'osx' ]]; then curl -sSL https://rvm.io/pkuczynski.asc | gpg --import -; fi
     # https://github.com/travis-ci/travis-ci/issues/10165
     - if [[ $TRAVIS_OS_NAME == 'osx' ]]; then rvm get stable; fi