fix(ci): bump LATEST_RELEASE to 2.0.0-rc.6

.travis.yml

@@ -10,7 +10,7 @@ env:
     - DBUS_SESSION_BUS_ADDRESS=/dev/null
     - DISPLAY=:99.0
     - CHROME_BIN=chromium-browser
-    - LATEST_RELEASE=2.0.0-rc.5
+    - LATEST_RELEASE=2.0.0-rc.6
     - TASK_FLAGS="--dgeni-log=warn"
   matrix:
     - TASK=lint

scripts/config/bad-code-excerpt-skip-patterns.txt

@@ -4,3 +4,4 @@
 /[jt]s/.*/api/router-deprecated/    # Obsolete API entries. No issue open yet.
 /ts/latest/guide/style-guide.html   # https://github.com/angular/angular.io/issues/2123
 /ts/latest/guide/upgrade.html       # In a transient state until RC6 - @filipe.silva
+/[jt]s/.*/api/forms/index/NG_VALIDATORS-let.html    # RC6 contains broken example tags