Update dependency prop-types to v15.7.1

Author: renovate-bot

package.json

@@ -4,7 +4,7 @@
   "private": true,
   "homepage": "http://vforge.github.io/react-ttt",
   "dependencies": {
-    "prop-types": "15.6.2",
+    "prop-types": "15.7.1",
     "react": "16.2.0",
     "react-dom": "16.7.0",
     "react-redux": "5.0.6",

yarn.lock

@@ -7046,12 +7046,12 @@ prompts@^0.1.9:
     kleur "^2.0.1"
     sisteransi "^0.1.1"
 
-prop-types@15.6.2, prop-types@^15.6.2:
-  version "15.6.2"
-  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.6.2.tgz#05d5ca77b4453e985d60fc7ff8c859094a497102"
+prop-types@15.7.1:
+  version "15.7.1"
+  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.7.1.tgz#2fa61e0a699d428b40320127733ee2931f05d9d1"
   dependencies:
-    loose-envify "^1.3.1"
     object-assign "^4.1.1"
+    react-is "^16.8.1"
 
 prop-types@^15.5.10, prop-types@^15.5.4, prop-types@^15.6.0:
   version "15.6.0"
@@ -7061,6 +7061,13 @@ prop-types@^15.5.10, prop-types@^15.5.4, prop-types@^15.6.0:
     loose-envify "^1.3.1"
     object-assign "^4.1.1"
 
+prop-types@^15.6.2:
+  version "15.6.2"
+  resolved "https://registry.yarnpkg.com/prop-types/-/prop-types-15.6.2.tgz#05d5ca77b4453e985d60fc7ff8c859094a497102"
+  dependencies:
+    loose-envify "^1.3.1"
+    object-assign "^4.1.1"
+
 proxy-addr@~2.0.4:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/proxy-addr/-/proxy-addr-2.0.4.tgz#ecfc733bf22ff8c6f407fa275327b9ab67e48b93"
@@ -7256,6 +7263,10 @@ react-error-overlay@^5.1.2:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/react-error-overlay/-/react-error-overlay-5.1.2.tgz#888957b884d4b25b083a82ad550f7aad96585394"
 
+react-is@^16.8.1:
+  version "16.8.1"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.8.1.tgz#a80141e246eb894824fb4f2901c0c50ef31d4cdb"
+
 [email protected]:
   version "5.0.6"
   resolved "https://registry.yarnpkg.com/react-redux/-/react-redux-5.0.6.tgz#23ed3a4f986359d68b5212eaaa681e60d6574946"