add name to contributors

Author: david-mkl

README.md

@@ -455,3 +455,4 @@ zipinfo .serverless/xxx.zip
  * [@andrewfarley](https://github.com/andrewfarley) - Implemented download caching and static caching
  * [@bweigel](https://github.com/bweigel) - adding the `slimPatternsAppendDefaults` option & fixing per-function packaging when some functions don't have requirements & Porting tests from bats to js!
  * [@squaresurf](https://github.com/squaresurf) - adding usePoetry option
+ * [@david-mk-lawrence](https://github.com/david-mk-lawrence) - added Lambda Layer support