Install peerDependencies conditionally

Author: CaptEmulation

.travis.yml

@@ -16,8 +16,9 @@ node_js:
 before_install:
   - export CXX="g++-4.8" CC="gcc-4.8"
 install:
-  # 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 [email protected]
+  # 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 install
 after_success:
   - npm run coveralls