cache spelling in README

Author: ashton-dad

README.md

@@ -459,7 +459,7 @@ zipinfo .serverless/xxx.zip
   `vendor` option
  * [@kichik](https://github.com/kichik) - Imposed windows & `noDeploy` support,
    switched to adding files straight to zip instead of creating symlinks, and
-   improved pip chache support when using docker.
+   improved pip cache support when using docker.
  * [@dee-me-tree-or-love](https://github.com/dee-me-tree-or-love) - the `slim` package option
  * [@alexjurkiewicz](https://github.com/alexjurkiewicz) - [docs about docker workflows](#native-code-dependencies-during-build)
  * [@andrewfarley](https://github.com/andrewfarley) - Implemented download caching and static caching