Update URL in issue templates (ytti#3447)

Author: robertcheramy

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,7 +7,7 @@ assignees: ''
 
 ---
 <!-- Check the box [X] -->
-- [ ] I have read and understood [docs/Issues.md](/docs/Issues.md).
+- [ ] I have read and understood [docs/Issues.md](https://github.com/ytti/oxidized/blob/master/docs/Issues.md).
 
 **Describe the bug**
 A clear and concise description of what the bug is.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -7,7 +7,7 @@ assignees: ''
 
 ---
 <!-- Check the box [X] -->
-- [ ] I have read and understood [docs/Issues.md](/docs/Issues.md).
+- [ ] I have read and understood [docs/Issues.md](https://github.com/ytti/oxidized/blob/master/docs/Issues.md).
 
 **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 [...]

.github/ISSUE_TEMPLATE/support-request.md

@@ -7,7 +7,7 @@ assignees: ''
 
 ---
 <!-- Check the box [X] -->
-- [ ] I have read and understood [docs/Issues.md](/docs/Issues.md).
+- [ ] I have read and understood [docs/Issues.md](https://github.com/ytti/oxidized/blob/master/docs/Issues.md).
 
 **Describe the problem**
 A clear and concise description of what your problem is.