install peerDeps in before_install, fix npm3 tests

sylvaindumont · web-flow · commit 0e90dba9e78c · 2018-02-11T18:58:49.000+01:00
diff --git a/.travis.yml b/.travis.yml
@@ -17,3 +17,4 @@ addons:
 osx_image: xcode8
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then export CXX=g++-4.8; fi
+  - npm install sharp@^0.18.0
