remove bitcore-explorers ref

package.json

@@ -20,7 +20,6 @@
   "dependencies": {
     "async": "^0.9.0",
     "bitcore": "^0.11.6",
-    "bitcore-explorers": "^0.10.3",
     "bitcore-wallet-utils": "0.0.13",
     "body-parser": "^1.11.0",
     "coveralls": "^2.11.2",
@@ -62,11 +61,14 @@
     "test": "./node_modules/.bin/mocha",
     "coveralls": "./node_modules/.bin/istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage"
   },
-  "contributors": [{
-    "name": "Ivan Socolsky",
-    "email": "ivan@bitpay.com"
-  }, {
-    "name": "Matias Alejo Garcia",
-    "email": "ematiu@gmail.com"
-  }]
+  "contributors": [
+    {
+      "name": "Ivan Socolsky",
+      "email": "ivan@bitpay.com"
+    },
+    {
+      "name": "Matias Alejo Garcia",
+      "email": "ematiu@gmail.com"
+    }
+  ]
 }