Add isTravisCI

Checks if the current environment is Travis CI.

snippets/isTravisCI.md

@@ -0,0 +1,13 @@
+### isTravisCI
+
+Checks if the current environment is [Travis CI](https://travis-ci.org/).
+
+Checks if the current environment has the `TRAVIS` and `CI` environment variables ([reference](https://docs.travis-ci.com/user/environment-variables/#Default-Environment-Variables)).
+
+```js
+const isTravisCI = ()) => 'TRAVIS' in process.env && 'CI' in process.env;
+```
+
+```js
+isTravisCI(); // true (if code is running on Travis CI)
+```

tag_database

@@ -80,6 +80,7 @@ isPrimitive:utility
 isPromiseLike:utility
 isString:utility
 isSymbol:utility
+isTravisCI:node
 isValidJSON:utility
 join:array
 JSONToDate:date