More fixes

Author: Matt Lewis

.travis.yml

@@ -33,7 +33,7 @@ jobs:
       node_js: 8
       env: WEBPACK_VERSION=canary JOB_PART=test
 before_install:
-  - 'npm i -g npm@^5.0.0'
+  - 'if [[ `npm -v` != 5* ]]; then npm i -g npm@^5.0.0; fi'
   - nvm --version
   - node --version
   - npm --version

appveyor.yml

@@ -23,7 +23,6 @@ install:
 before_test:
   - cmd: npm install webpack@%webpack_version%
 test_script:
-  - cmd: npm i -g npm@latest
   - node --version
   - npm --version
   - cmd: npm run appveyor:%job_part%