Install peerDependencies conditionally

Author: CaptEmulation

.travis.yml

@@ -15,9 +15,9 @@ node_js:
   - "v0.12.7"
   - "v4"
 script:
-# When all dependencies declare bitcore-lib as a peerDependency this can be bumped up, but this matches the current version expected by dependencies
-  - npm install bitcore-lib@0.13.7
-  - npm install
+  # Install peerDependencies on > npm3
+  # When all dependencies declare bitcore-lib as a peerDependency this can be bumped up, but this matches the current ecosystem version expected by dependencies
+  - if [ $(npm --version | sed 's/\..*//g') -ge 3 ]; then npm install [email protected]; fi
   - npm run regtest
   - npm run test
   - npm run jshint