Added checks to make sure the specified track exists

Added precondition checks to validate input files and paths to return more informative error messages as per #2

node_modules/extglob/changelog.md

@@ -0,0 +1,25 @@
+## Changelog
+
+### v2.0.0
+
+**Added features**
+
+- Adds [.capture](readme.md#capture) method for capturing matches, thanks to [devongovett](https://github.com/devongovett)
+
+
+### v1.0.0
+
+**Breaking changes**
+
+- The main export now returns the compiled string, instead of the object returned from the compiler
+
+**Added features**
+
+- Adds a `.create` method to do what the main function did before v1.0.0
+
+**Other changes**
+
+- adds `expand-brackets` parsers/compilers to handle nested brackets and extglobs
+- uses `to-regex` to build regex for `makeRe` method
+- improves coverage
+- optimizations