Fix formatting of GitHub issue template
Fix formatting of GitHub issue template

There is actually an easier way to format comments, which doesn't
require a hack and also fixes the dispay in non-monospace fonts.

brancz/prometheus,Conorbro/prometheus,Gouthamve/prometheus,kangwoo/prometheus,prometheus/prometheus,kangwoo/prometheus,AlekSi/prometheus,Stackdriver/stackdriver-prometheus,prometheus/prometheus,AlekSi/prometheus,Conorbro/prometheus,amorken/prometheus,keegancsmith/prometheus,JavierZunzunegui/prometheus,prometheus/prometheus,Stackdriver/stackdriver-prometheus,prometheus/prometheus,yanghongkjxy/prometheus,Conorbro/prometheus,JavierZunzunegui/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,Stackdriver/stackdriver-prometheus,alileza/prometheus,brancz/prometheus,Gouthamve/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,JavierZunzunegui/prometheus,amorken/prometheus,Conorbro/prometheus,kangwoo/prometheus,alileza/prometheus,AlekSi/prometheus,keegancsmith/prometheus,yanghongkjxy/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,amorken/prometheus,JavierZunzunegui/prometheus,AlekSi/prometheus,Gouthamve/prometheus,yanghongkjxy/prometheus,yanghongkjxy/prometheus,Stackdriver/stackdriver-prometheus,keegancsmith/prometheus,amorken/prometheus,brancz/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,kangwoo/prometheus,brancz/prometheus,alileza/prometheus