Fix Travis CI colors in snapshots by always forcing color on when in …

…CI. (jestjs#8270)

* Travis CI color fix

* Re-enable travis build on master

.travis.yml

@@ -3,6 +3,10 @@ language: node_js
 node_js:
   - '10'
 
+branches:
+   only:
+   - master
+
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash
   - export PATH="$HOME/.yarn/bin:$PATH"

package.json

@@ -90,8 +90,8 @@
     "postinstall": "opencollective postinstall && yarn build",
     "publish": "yarn build-clean && yarn build && lerna publish --silent",
     "test-ci-es5-build-in-browser": "karma start --single-run",
-    "test-ci": "yarn jest-coverage -i --config jest.config.ci.js && yarn test-leak && node scripts/mapCoverage.js && codecov",
-    "test-ci-partial": "yarn jest -i --config jest.config.ci.js",
+    "test-ci": "yarn jest-coverage --color -i --config jest.config.ci.js && yarn test-leak && node scripts/mapCoverage.js && codecov",
+    "test-ci-partial": "yarn jest --color -i --config jest.config.ci.js",
     "test-pretty-format-perf": "node packages/pretty-format/perf/test.js",
     "test-leak": "yarn jest -i --detectLeaks jest-mock jest-diff jest-repl",
     "test": "yarn lint && yarn jest",