fix(srcclr): Properly enable SourceClear (#214)

## Summary
Fix the indentation in .travis.yml.

## Issues
- OASIS-4076

Author: nchilada

.travis.yml

@@ -22,7 +22,7 @@ matrix:
 before_install: cd packages/optimizely-sdk
 install: npm install
 addons:
-srcclr: true
+  srcclr: true
 script: npm test
 after_success: npm run coveralls