docs: update mongodb downloads dir

Author: vladholubiev

.circleci/config.yml

@@ -20,7 +20,7 @@ jobs:
           paths:
             - node_modules
             - yarn.lock
-            - ~/.mongodb-binaries
+            - ./node_modules/.cache/mongodb-memory-server/mongodb-binaries
           key: v2-dependencies-{{ checksum "package.json" }}
 
       - run: yarn test

readme.md

@@ -71,7 +71,7 @@ it('should insert a doc into collection', async () => {
 });
 ```
 
-Cache MongoDB binary in CI by putting this folder to the list of cached paths: `~/.mongodb-binaries`
+Cache MongoDB binary in CI by putting this folder to the list of cached paths: `./node_modules/.cache/mongodb-memory-server/mongodb-binaries`
 
 ## See Also