Fix supported version of RN in Readme (microsoft#1264)

readme update

README.md

@@ -68,7 +68,7 @@ We try our best to maintain backwards compatability of our plugin with previous
 | v0.45                   | v3.0+ *(RN refactored instance manager code)*         |
 | v0.46                   | v4.0+ *(RN refactored js bundle loader code)*         |
 | v0.46-v0.53             | v5.1+ *(RN removed unused registration of JS modules)*|
-| v0.54                   | v5.3+ *(Android Gradle Plugin 3.x integration)*       |
+| v0.54-v0.55             | v5.3+ *(Android Gradle Plugin 3.x integration)*       |
 | v0.55+                  | TBD :) We work hard to respond to new RN releases, but they do occasionally break us. We will update this chart with each RN release, so that users can check to see what our "official" support is.
 
 ### Supported Components