chore: change yarn logic

.travis.yml

@@ -56,10 +56,11 @@ jobs:
         - rvm get stable
         - rvm install 2.4
         - gem install github_changelog_generator
-        - yarn global add vsce semantic-release@^8.2.0 semantic-release-visualstudio-marketplace-version
         - yarn install
       script:
         - yarn build
+        - yarn global add vsce
+        - yarn install --no-lockfile semantic-release@^8.2.0 semantic-release-visualstudio-marketplace-version
         - semantic-release pre
         - github_changelog_generator --no-verbose -u buehler -p typescript-hero --enhancement-labels "enhancement,feature" --include-labels "bug,enhancement,feature" --future-release $(node -p "require('./package.json').version")
       after_script: