Update README to clarify expectations; update JS bindings

Author: reteps

README.md

@@ -50,12 +50,19 @@ repos:
 
 ## Limitations
 
-- The `RUN` parser currently doesn't support grouping or semicolons in commands
+- The `RUN` parser currently doesn't support grouping or semicolons in commands. Adding semicolon support is a non-trivial task.
+
+
 - No line wrapping is performed for long JSON commands
 - The `# escape=X` directive is not supported
 
 Contributions are welcome!
 
+## Issues
+
+- This is not production software until the `1.0.0` release, please treat it as such.
+- Please file issues for any bugs or feature requests!
+
 ## Features
 
 - Format `RUN` steps with <https://github.com/mvdan/sh>