Update dependency fetch-mock to v7.3.7

package.json

@@ -42,7 +42,7 @@
     "@types/jest": "24.0.15",
     "chai": "4.2.0",
     "fetch-everywhere": "1.0.5",
-    "fetch-mock": "7.3.3",
+    "fetch-mock": "7.3.7",
     "husky": "2.4.1",
     "jest": "24.8.0",
     "prettier": "1.18.2",

yarn.lock

@@ -1460,6 +1460,11 @@ core-js@^2.4.0, core-js@^2.5.0:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.5.tgz#44bc8d249e7fb2ff5d00e0341a7ffb94fbf67895"
   integrity sha512-klh/kDpwX8hryYL14M9w/xei6vrv6sE8gTHDG7/T/+SEovB/G4ejwcfE/CBzO6Edsu+OETZMZ3wcX/EjUkrl5A==
 
+core-js@^2.6.9:
+  version "2.6.9"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.9.tgz#6b4b214620c834152e179323727fc19741b084f2"
+  integrity sha512-HOpZf6eXmnl7la+cUdMnLvUxKNqLUzJvgIziQ0DiF3JwSImNphIqdGqzj6hIKyX04MmV0poclQ7+wjWvxQyR2A==
+
 core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
@@ -2056,12 +2061,13 @@ fetch-everywhere@1.0.5:
     node-fetch "^1.0.1"
     whatwg-fetch ">=0.10.0"
 
-fetch-mock@7.3.3:
-  version "7.3.3"
-  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-7.3.3.tgz#d1abdf309cdef8adb4b0fc0596d3f97fcfbd4528"
-  integrity sha512-MHKcwZ4n9TmnfnVfelUBrrfxtC9tztafIR+F8l/Yu9N+y48fU1BAwj3iSxhYFYELVw73rCZh2DPWtWCekY/t+w==
+fetch-mock@7.3.7:
+  version "7.3.7"
+  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-7.3.7.tgz#689fe1a52d0bba05cfbc3413e19e7970d6528a98"
+  integrity sha512-Tl2OEdsLXaXwv+V61s6Ar38FiGrhKGzokLtToiW1Otu6ei0e+g8Apoug5Zc/AFBipAfuiO/4vXV5IP6/lVApBA==
   dependencies:
     babel-polyfill "^6.26.0"
+    core-js "^2.6.9"
     glob-to-regexp "^0.4.0"
     path-to-regexp "^2.2.1"
     whatwg-url "^6.5.0"