build: update linting config

Updates the lint config not to require `OnPush` to be set anymore.

Author: crisbeto

tslint.json

@@ -110,13 +110,12 @@
             },
             "excludeFiles": ["**/dev-app/**", "**/docs/**", "**/*.spec.ts"]
           },
-          // Enforce OnPush & standalone even in the dev-app.
           {
             "argument": 0,
             "properties": {
-              "changeDetection": "\\.OnPush$"
+              "!changeDetection": ".*"
             },
-            "excludeFiles": ["**/docs/**", "**/*.spec.ts"]
+            "excludeFiles": ["**/docs/**", "**/*.spec.ts", "**/dev-app/**"]
           }
         ],
         "Directive": [