Set @expo/config-plugins as peer dependency

Author: zoontek

example/ios/Podfile.lock

@@ -2122,7 +2122,7 @@ PODS:
     - React-perflogger (= 0.80.0)
     - React-utils (= 0.80.0)
     - SocketRocket
-  - RNLocalize (3.4.2):
+  - RNLocalize (3.5.1):
     - boost
     - DoubleConversion
     - fast_float
@@ -2456,7 +2456,7 @@ SPEC CHECKSUMS:
   ReactAppDependencyProvider: 3267432b637c9b38e86961b287f784ee1b08dde0
   ReactCodegen: 5d41e1df061200130dd326e55cdfdf94b0289c6e
   ReactCommon: b028d09a66e60ebd83ca59d8cc9a1216360db147
-  RNLocalize: 9c85c2ed7315e7d47c63af1d12ae16d6828edb48
+  RNLocalize: e79d6e459f5ddeebfba39d871397738b70115b43
   SocketRocket: d4aabe649be1e368d1318fdf28a022d714d65748
   Yoga: 0c4b7d2aacc910a1f702694fa86be830386f4ceb