Update bug_report.md

Author: simontreny

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,17 +1,17 @@
 ### Describe the bug
-
 <!-- A clear and concise description of what the bug is. -->
 <!-- Attach screenshots if possible. -->
 
-### To Reproduce
 
+### To reproduce
 <!-- Steps to reproduce the behavior. -->
 
-### Expected behavior
 
+### Expected behavior
 <!-- A clear and concise description of what you expected to happen. -->
 
-### Your Environment
+
+### Your environment
 
 **React Native version:**