Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Submit a bug report.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**DELETE ALL OF THIS TEXT BEFORE SUBMITTING**
+
+If you think you've found a bug, it will be helpful to run with `#define MA_DEBUG_OUTPUT` above your miniaudio implementation like the code below and to include the output with this bug report:
+
+    #define MA_DEBUG_OUTPUT
+    #define MINIAUDIO_IMPLEMENTATION
+    #include "miniaudio.h"
+
+If you are having issues with playback, please run the simple_payback_sine example and report whether or not it's consistent with what's happening in your program.