doc: update issue template
doc: update issue template

Change-Id: Iaa23d27043e6a050075b40072e466623418ba977
Reviewed-on: https://go-review.googlesource.com/19878
Reviewed-by: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

cloudflare/go,ImJasonH/go,josharian/go,linux-on-ibm-z/go,goodlang/good,ganboing/go-esx,codestation/go,linux-on-ibm-z/go,theif519/go,theif519/go,4ad/go,miolini/go,nawawi/go,linux-on-ibm-z/go,4ad/go,goodlang/good,nawawi/go,christopher-henderson/Go,akutz/go,vsekhar/elastic-go,miolini/go,derekmarcotte/go,Samurais/go,miolini/go,momchil-velikov/go,goodlang/good,goodlang/good,4ad/go,Samurais/go,Samurais/go,linux-on-ibm-z/go,ganboing/go-esx,josharian/go,CAFxX/go,josharian/go,theif519/go,codestation/go,Samurais/go,Samurais/go,theif519/go,polyverse-security/go,Cofyc/go,suncycheng/go,golang/go,4ad/go,polyverse-security/go,vsekhar/elastic-go,vanloswang/go,suncycheng/go,ganboing/go-esx,Samurais/go,golang/go,polyverse-security/go,Cofyc/go,akutz/go,derekmarcotte/go,suncycheng/go,linux-on-ibm-z/go,josharian/go,josharian/go,cloudflare/go,CAFxX/go,derekmarcotte/go,cloudflare/go,miolini/go,codestation/go,momchil-velikov/go,codestation/go,codestation/go,polyverse-security/go,vsekhar/elastic-go,cloudflare/go,momchil-velikov/go,akutz/go,vsekhar/elastic-go,nawawi/go,akutz/go,vanloswang/go,CAFxX/go,momchil-velikov/go,vanloswang/go,josharian/go,polyverse-security/go,cloudflare/go,linux-on-ibm-z/go,momchil-velikov/go,cloudflare/go,vsekhar/elastic-go,theif519/go,vsekhar/elastic-go,josharian/go,derekmarcotte/go,derekmarcotte/go,Cofyc/go,akutz/go,codestation/go,4ad/go,momchil-velikov/go,derekmarcotte/go,Samurais/go,miolini/go,vsekhar/elastic-go,polyverse-security/go,nawawi/go,josharian/go,theif519/go,golang/go,golang/go,CAFxX/go,vanloswang/go,4ad/go,Cofyc/go,golang/go,vanloswang/go,CAFxX/go,derekmarcotte/go,goodlang/good,miolini/go,goodlang/good,theif519/go,vsekhar/elastic-go,CAFxX/go,ImJasonH/go,vanloswang/go,suncycheng/go,Cofyc/go,linux-on-ibm-z/go,goodlang/good,suncycheng/go,ganboing/go-esx,akutz/go,vanloswang/go,ImJasonH/go,ImJasonH/go,suncycheng/go,vanloswang/go,codestation/go,ImJasonH/go,golang/go,golang/go,akutz/go,ganboing/go-esx,ImJasonH/go,suncycheng/go,CAFxX/go,suncycheng/go,linux-on-ibm-z/go,CAFxX/go,codestation/go,Samurais/go,akutz/go,momchil-velikov/go,ganboing/go-esx,4ad/go,polyverse-security/go,Cofyc/go,Cofyc/go,ganboing/go-esx,polyverse-security/go,4ad/go,ImJasonH/go,ImJasonH/go,momchil-velikov/go,theif519/go,nawawi/go,cloudflare/go,nawawi/go,miolini/go,nawawi/go,derekmarcotte/go,cloudflare/go,goodlang/good,miolini/go,ganboing/go-esx,golang/go,nawawi/go,Cofyc/go