Update ISSUE_TEMPLATE.md (facebook#2643)

Adding the word "also" to "Can you also reproduce the problem with npm 4.x?" clarifies that contributors aren't _expected_ to use NPM v4, but we're interested in understanding which environments the reported issue affects.

Author: ashtonsix

.github/ISSUE_TEMPLATE.md

@@ -25,7 +25,7 @@
 -->
 
 
-### Can you reproduce the problem with npm 4.x?
+### Can you also reproduce the problem with npm 4.x?
 
 <!--
   Many errors, especially related to "missing modules", are due to npm bugs.