update issue/pr templates

would fix things like #830

.github/ISSUE_TEMPLATE.md

@@ -1,3 +1,8 @@
+- [ ] I have marked all applicable categories:
+    + [ ] exception-raising bug
+    + [ ] visual output bug
+    + [ ] documentation request (i.e. "X is missing from the documentation." If instead I want to ask "how to use X?" I understand [StackOverflow#tqdm] is more appropriate)
+    + [ ] new feature request
 - [ ] I have visited the [source website], and in particular
   read the [known issues]
 - [ ] I have searched through the [issue tracker] for duplicates
@@ -11,3 +16,4 @@
   [source website]: https://github.com/tqdm/tqdm/
   [known issues]: https://github.com/tqdm/tqdm/#faq-and-known-issues
   [issue tracker]: https://github.com/tqdm/tqdm/issues?q=
+  [StackOverflow#tqdm]: https://stackoverflow.com/questions/tagged/tqdm

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,3 +1,12 @@
+- [ ] I have marked all applicable categories:
+    + [ ] exception-raising fix
+    + [ ] visual output fix
+    + [ ] documentation modification
+    + [ ] new feature
+- [ ] If applicable, I have mentioned the relevant/related issue(s)
+
+Less important but also useful:
+
 - [ ] I have visited the [source website], and in particular
   read the [known issues]
 - [ ] I have searched through the [issue tracker] for duplicates
@@ -7,7 +16,6 @@
   import tqdm, sys
   print(tqdm.__version__, sys.version, sys.platform)
   ```
-- [ ] If applicable, I have mentioned the relevant/related issue(s)
 
   [source website]: https://github.com/tqdm/tqdm/
   [known issues]: https://github.com/tqdm/tqdm/#faq-and-known-issues