docs: fixed typo (#41)

Author: DarrenWong

ipc/README.md

@@ -1,6 +1,6 @@
 # IPC
 
-Suppose we want to cache a remote data source in memroy, we implement three different ways to update cache.
+Suppose we want to cache a remote data source in memory, we implement three different ways to update cache.
 
 1. Force all workers update memory cache from remote with a long interval.
 2. Check remote source if it is changed, and then update cache. Check action can be more frequently if the source don't change everytime.