Update dependency react-ga to v2.5.6 (#845)

package.json

@@ -99,7 +99,7 @@
     "react-dnd-html5-backend": "6.0.0",
     "react-dom": "16.6.3",
     "react-dropzone": "6.2.4",
-    "react-ga": "2.5.3",
+    "react-ga": "2.5.6",
     "react-intl": "2.7.2",
     "react-rangeslider": "2.2.0",
     "react-sizeme": "2.5.2",

yarn.lock

@@ -14462,13 +14462,10 @@ react-fuzzy@^0.5.2:
     fuse.js "^3.0.1"
     prop-types "^15.5.9"
 
-[email protected]:
-  version "2.5.3"
-  resolved "https://registry.yarnpkg.com/react-ga/-/react-ga-2.5.3.tgz#0f447c73664c069a5fc341f6f431262e3d4c23c4"
-  integrity sha512-25wvPv1PVLDLhw1gEYP33h0V2sJHahKMfUCAxhq8JPYmNQwx1fcjJAkJk+WmSqGN93lHLhExDkxy3SQizQnx3A==
-  optionalDependencies:
-    prop-types "^15.6.0"
-    react "^15.6.2 || ^16.0"
+[email protected]:
+  version "2.5.6"
+  resolved "https://registry.yarnpkg.com/react-ga/-/react-ga-2.5.6.tgz#5a2e2fa78ae298e5b0a4498210eeec631ef1b562"
+  integrity sha512-g04dz6zrbdHRxVaURPWT3RUbjLflh74sS6dCuhGeZupj7ii+UEt9lwTjALb2ST2w+7wAmzG1YqYlNX4yvRXe1g==
 
 react-html-attributes@^1.4.2:
   version "1.4.3"
@@ -14691,7 +14688,7 @@ react-treebeard@^3.1.0:
     shallowequal "^1.1.0"
     velocity-react "^1.4.1"
 
-react@*, [email protected], "react@^15.6.2 || ^16.0", react@^16.4.2:
+react@*, [email protected], react@^16.4.2:
   version "16.6.3"
   resolved "https://registry.yarnpkg.com/react/-/react-16.6.3.tgz#25d77c91911d6bbdd23db41e70fb094cc1e0871c"
   integrity sha512-zCvmH2vbEolgKxtqXL2wmGCUxUyNheYn/C+PD1YAjfxHC54+MhdruyhO7QieQrYsYeTxrn93PM2y0jRH1zEExw==