just update issue template

Author: Kanchalai Tanglertsampan

.travis.yml

@@ -16,9 +16,6 @@ matrix:
 branches:
   only:
   - master
-  - release-2.1
-  - release-2.2
-  - release-2.3
 
 install:
   - npm uninstall typescript --no-save

issue_template.md

@@ -2,7 +2,7 @@
 <!-- QUESTIONS: This is not a general support forum! Ask Qs at http://stackoverflow.com/questions/tagged/typescript -->
 <!-- SUGGESTIONS: See https://github.com/Microsoft/TypeScript-wiki/blob/master/Writing-Good-Design-Proposals.md -->
 
-**TypeScript Version:**  2.2.1 / nightly (2.2.0-dev.201xxxxx)
+**TypeScript Version:**  2.4.0 / nightly (2.5.0-dev.201xxxxx)
 
 **Code**