[README] Add notes for the context generator changes in #144

Author: t2ym

README.md

@@ -5,6 +5,9 @@
 
 Thin Hook Preprocessor (experimental)
 
+## Notes
+- [Context Generator Compatibility] Since [0.0.148](https://github.com/t2ym/thin-hook/releases/tag/0.0.148) with [#144](https://github.com/t2ym/thin-hook/issues/144), the old context generator "method" is renamed as "oldMethod" and the "cachedMethod" is renamed as "method" and become the new default context generator. The "cachedMethod" remains as an alias for the "method" context generator. There are slight changes in the new "method" context generator. A warning message is shown on the debug console to notify the change.
+
 ### Native API Access Graph generated via hook callback function (view2 of thin-hook/demo/)
 
 <img src="https://raw.githubusercontent.com/wiki/t2ym/thin-hook/native_api_access_graph.png" width="768px">