Update ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

@@ -1,6 +1,7 @@
 **Please read https://github.com/inorichi/tachiyomi/blob/master/.github/CONTRIBUTING.md before posting**
 
-Remove line above and describe your issue here. Fill out version below.
+Remove line above and describe your issue here. Fill out version below. Keep the empty line above the dashes.
 
 ---
 Version: r000 or v0.0.0
+(other relevant info like OS)