Upgrade extend to ^3.0.2

Snyk vulnerability: https://app.snyk.io/org/segment-pro/project/fdd0c84c-35c2-465e-83f3-9770fd4bc1a1/pr-check/04f9695e-9ff0-40de-8bc3-ab9ef9ebdf7b?refs=bb53041f707d3fb84318776053efc03b075180f7..aa10d2c750456e3a57a642b92a861fda4a913387

Author: fathyb

package.json

@@ -35,7 +35,7 @@
     "component-emitter": "^1.2.0",
     "debug": "^2.2.0",
     "domify": "^1.4.0",
-    "extend": "3.0.1",
+    "extend": "^3.0.2",
     "is": "^3.1.0",
     "load-iframe": "^1.0.0",
     "next-tick": "^0.2.2",

yarn.lock

@@ -1572,10 +1572,15 @@ expand-range@^1.8.1:
   dependencies:
     fill-range "^2.1.0"
 
-extend@3, extend@3.0.1, extend@^3.0.0, extend@~3.0.0, extend@~3.0.1:
+extend@3, extend@^3.0.0, extend@~3.0.0, extend@~3.0.1:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.1.tgz#a755ea7bc1adfcc5a31ce7e762dbaadc5e636444"
 
+extend@^3.0.2:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/extend/-/extend-3.0.2.tgz#f8b1136b4071fbd8eb140aff858b1019ec2915fa"
+  integrity sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==
+
 extglob@^0.3.1:
   version "0.3.2"
   resolved "https://registry.yarnpkg.com/extglob/-/extglob-0.3.2.tgz#2e18ff3d2f49ab2765cec9023f011daa8d8349a1"