Bump proxyquire from 1.8.0 to 2.1.0

Bumps [proxyquire](https://github.com/thlorenz/proxyquire) from 1.8.0 to 2.1.0.
- [Release notes](https://github.com/thlorenz/proxyquire/releases)
- [Commits](thlorenz/proxyquire@v1.8.0...v2.1.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -32,7 +32,7 @@
     "get-port": "^3.2.0",
     "istanbul": "v1.1.0-alpha.1",
     "mocha": "^3.5.0",
-    "proxyquire": "^1.8.0",
+    "proxyquire": "^2.1.0",
     "sinon": "^2.4.1"
   },
   "dependencies": {

yarn.lock

@@ -1336,13 +1336,13 @@ progress@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/progress/-/progress-2.0.0.tgz#8a1be366bf8fc23db2bd23f10c6fe920b4389d1f"
 
-proxyquire@^1.8.0:
-  version "1.8.0"
-  resolved "https://registry.yarnpkg.com/proxyquire/-/proxyquire-1.8.0.tgz#02d514a5bed986f04cbb2093af16741535f79edc"
+proxyquire@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/proxyquire/-/proxyquire-2.1.0.tgz#c2263a38bf0725f2ae950facc130e27510edce8d"
   dependencies:
     fill-keys "^1.0.2"
     module-not-found-error "^1.0.0"
-    resolve "~1.1.7"
+    resolve "~1.8.1"
 
 pseudomap@^1.0.2:
   version "1.0.2"
@@ -1420,9 +1420,11 @@ resolve-from@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/resolve-from/-/resolve-from-1.0.1.tgz#26cbfe935d1aeeeabb29bc3fe5aeb01e93d44226"
 
-resolve@~1.1.7:
-  version "1.1.7"
-  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.1.7.tgz#203114d82ad2c5ed9e8e0411b3932875e889e97b"
+resolve@~1.8.1:
+  version "1.8.1"
+  resolved "https://registry.yarnpkg.com/resolve/-/resolve-1.8.1.tgz#82f1ec19a423ac1fbd080b0bab06ba36e84a7a26"
+  dependencies:
+    path-parse "^1.0.5"
 
 restore-cursor@^2.0.0:
   version "2.0.0"