chore: Update issue template markdown

Author: jongracecox

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,28 +7,28 @@ assignees: jongracecox
 
 ---
 
-**Describe the bug**
+## Describe the bug
 A clear and concise description of what the bug is.
 
-**To Reproduce**
+## To Reproduce
 Provide the simplest example of code or commands to reproduce the behavior.
 
-**Expected behavior**
+## Expected behavior
 A clear and concise description of what you expected to happen.
 
-**Screenshots**
+## Screenshots
 If applicable, add screenshots to help explain your problem.
 
-** Python version: (please complete the following information)**
+## Python version: (please complete the following information)
 - 2.7
 - 3.6
 - 3.7
 - ...
 
-** Operating system: (please complete the following information)**
+## Operating system: (please complete the following information)
 - Linux
 - Windows
 - Mac OS
 
-**Additional context**
+## Additional context
 Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,14 +7,14 @@ assignees: jongracecox
 
 ---
 
-**Is your feature request related to a problem? Please describe.**
+## Is your feature request related to a problem? Please describe.
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
 
-**Describe the solution you'd like**
+## Describe the solution you'd like
 A clear and concise description of what you want to happen.
 
-**Describe alternatives you've considered**
+## Describe alternatives you've considered
 A clear and concise description of any alternative solutions or features you've considered.
 
-**Additional context**
+## Additional context
 Add any other context or screenshots about the feature request here.