*: update ISSUE_TEMPLATE (#2131)
*: update ISSUE_TEMPLATE (#2131)

Most of the time, the issue is not related to go version and go env, so we move them down.
And `go version` contains operating system and processor architecture info, so we don't need
'go env' information in template.
kyle-wang/tidb,gaocegege/tidb,gaocegege/tidb,qhsong/tidb,ming-relax/tidb,ngaut/tidb,yuanwhy/tidb,liyu4/tidb,kyle-wang/tidb,8cbx/tidb,qiuyesuifeng/tidb,Cofyc/tidb,c4pt0r/tidb,kyle-wang/tidb,JinheLin/tidb,ngaut/tidb,wusphinx/tidb,silentred/tidb,ueizhou/tidb,pingcap/tidb,XuHuaiyu/tidb,myrice/tidb,silentred/tidb,astaxie/tidb,Nify/tidb,mccxj/tidb,silenceper/tidb,yangwenmai/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,zs634134578/tidb,andelf/tidb,spongedu/tidb,c4pt0r/tidb,ming-relax/tidb,kyle-wang/tidb,EvilMcJerkface/tidb,c4pt0r/tidb,qiuyesuifeng/tidb,zs634134578/tidb,tiancaiamao/tidb,spongedu/tidb,liyu4/tidb,mccxj/tidb,anywhy/tidb,anywhy/tidb,CodeRushing/tidb,pingcap/tidb,zimulala/tidb,JinheLin/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,pingcap/tidb,yuanwhy/tidb,yangwenmai/tidb,8cbx/tidb,coocood/tidb,pingcap/tidb,ngaut/tidb,simon-xia/tidb,qhsong/tidb,louishust/tidb,zimulala/tidb,myrice/tidb,cosmtrek/tidb,c4pt0r/tidb,simon-xia/tidb,Nify/tidb,Cofyc/tidb,CodeRushing/tidb,ueizhou/tidb,XuHuaiyu/tidb,tiancaiamao/tidb,wusphinx/tidb,c4pt0r/tidb,EvilMcJerkface/tidb,silenceper/tidb,cosmtrek/tidb,astaxie/tidb,kyle-wang/tidb,pingcap/tidb,andelf/tidb,louishust/tidb,coocood/tidb