deps: update react-native to 0.57.8

Bumping React to 16.6.3 is a requirement for this update.

ios/Podfile.lock

     - "GoogleToolboxForMac/NSDictionary+URLArguments (~> 2.1)"
     - "GoogleToolboxForMac/NSString+URLArguments (~> 2.1)"
     - GTMSessionFetcher/Core (~> 1.1)
-  - GoogleToolboxForMac/DebugUtils (2.1.4):
-    - GoogleToolboxForMac/Defines (= 2.1.4)
-  - GoogleToolboxForMac/Defines (2.1.4)
-  - "GoogleToolboxForMac/NSDictionary+URLArguments (2.1.4)":
-    - GoogleToolboxForMac/DebugUtils (= 2.1.4)
-    - GoogleToolboxForMac/Defines (= 2.1.4)
-    - "GoogleToolboxForMac/NSString+URLArguments (= 2.1.4)"
-  - "GoogleToolboxForMac/NSString+URLArguments (2.1.4)"
+  - GoogleToolboxForMac/DebugUtils (2.2.0):
+    - GoogleToolboxForMac/Defines (= 2.2.0)
+  - GoogleToolboxForMac/Defines (2.2.0)
+  - "GoogleToolboxForMac/NSDictionary+URLArguments (2.2.0)":
+    - GoogleToolboxForMac/DebugUtils (= 2.2.0)
+    - GoogleToolboxForMac/Defines (= 2.2.0)
+    - "GoogleToolboxForMac/NSString+URLArguments (= 2.2.0)"
+  - "GoogleToolboxForMac/NSString+URLArguments (2.2.0)"
   - GTMSessionFetcher/Core (1.2.1)
   - ObjectiveDropboxOfficial (3.9.2)
-  - React (0.57.6):
-    - React/Core (= 0.57.6)
+  - React (0.57.8):
+    - React/Core (= 0.57.8)
   - react-native-background-timer (2.0.0):
     - React
   - react-native-calendar-events (1.6.3):
     - React
   - react-native-webrtc (1.67.1):
     - React
-  - React/Core (0.57.6):
-    - yoga (= 0.57.6.React)
-  - React/CxxBridge (0.57.6):
+  - React/Core (0.57.8):
+    - yoga (= 0.57.8.React)
+  - React/CxxBridge (0.57.8):
     - Folly (= 2016.10.31.00)
     - React/Core
     - React/cxxreact
-  - React/cxxreact (0.57.6):
+  - React/cxxreact (0.57.8):
     - boost-for-react-native (= 1.63.0)
     - Folly (= 2016.10.31.00)
     - React/jschelpers
     - React/jsinspector
-  - React/DevSupport (0.57.6):
+  - React/DevSupport (0.57.8):
     - React/Core
     - React/RCTWebSocket
-  - React/fishhook (0.57.6)
-  - React/jschelpers (0.57.6):
+  - React/fishhook (0.57.8)
+  - React/jschelpers (0.57.8):
     - Folly (= 2016.10.31.00)
     - React/PrivateDatabase
-  - React/jsinspector (0.57.6)
-  - React/PrivateDatabase (0.57.6)
-  - React/RCTActionSheet (0.57.6):
+  - React/jsinspector (0.57.8)
+  - React/PrivateDatabase (0.57.8)
+  - React/RCTActionSheet (0.57.8):
     - React/Core
-  - React/RCTAnimation (0.57.6):
+  - React/RCTAnimation (0.57.8):
     - React/Core
-  - React/RCTBlob (0.57.6):
+  - React/RCTBlob (0.57.8):
     - React/Core
-  - React/RCTImage (0.57.6):
+  - React/RCTImage (0.57.8):
     - React/Core
     - React/RCTNetwork
-  - React/RCTLinkingIOS (0.57.6):
+  - React/RCTLinkingIOS (0.57.8):
     - React/Core
-  - React/RCTNetwork (0.57.6):
+  - React/RCTNetwork (0.57.8):
     - React/Core
-  - React/RCTText (0.57.6):
+  - React/RCTText (0.57.8):
     - React/Core
-  - React/RCTWebSocket (0.57.6):
+  - React/RCTWebSocket (0.57.8):
     - React/Core
     - React/fishhook
     - React/RCTBlob
   - SDWebImage/GIF (4.4.3):
     - FLAnimatedImage (~> 1.0)
     - SDWebImage/Core
-  - yoga (0.57.6.React)
+  - yoga (0.57.8.React)
 
 DEPENDENCIES:
   - DoubleConversion (from `../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec`)
   Folly: c89ac2d5c6ab169cd7397ef27485c44f35f742c7
   glog: e8acf0ebbf99759d3ff18c86c292a5898282dcde
   GoogleSignIn: 7ff245e1a7b26d379099d3243a562f5747e23d39
-  GoogleToolboxForMac: 91c824d21e85b31c2aae9bb011c5027c9b4e738f
+  GoogleToolboxForMac: ff31605b7d66400dcec09bed5861689aebadda4d
   GTMSessionFetcher: 32aeca0aa144acea523e1c8e053089dec2cb98ca
   ObjectiveDropboxOfficial: aa792e0556ceb7b72955fa29a2709072f6e35fd9
   React: 1fe0eb13d90b625d94c3b117c274dcfd2e760e11

package.json

     "moment-duration-format": "2.2.2",
     "postis": "2.2.0",
     "prop-types": "15.6.0",
-    "react": "16.6.1",
-    "react-dom": "16.5.0",
+    "react": "16.6.3",
+    "react-dom": "16.6.3",
     "react-emoji-render": "0.4.6",
     "react-i18next": "7.13.0",
     "react-linkify": "0.2.2",
-    "react-native": "0.57.6",
+    "react-native": "0.57.8",
     "react-native-background-timer": "2.0.0",
     "react-native-calendar-events": "github:wmcmahan/react-native-calendar-events#056807286da610d884fb6b4c8ca187a767b261f7",
     "react-native-callstats": "3.53.4",