update docs

docs/utils.md

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+# utils
+jc - JSON CLI output utility utils
+## warning_message
+```python
+warning_message(message)
+```
+Prints a warning message for non-fatal issues
+## error_message
+```python
+error_message(message)
+```
+Prints an error message for fatal issues
+## compatibility
+```python
+compatibility(mod_name, compatible)
+```
+Checks for the parser's compatibility with the running OS platform.
+
+compatible options:
+
+    linux, darwin, cygwin, win32, aix, freebsd
+