Update dependencies

Author: AJ Keller

package.json

@@ -1,6 +1,6 @@
 {
   "name": "openbci",
-  "version": "1.5.1",
+  "version": "1.5.2",
   "description": "The official Node.js SDK for the OpenBCI Biosensor Board.",
   "main": "openBCIBoard",
   "scripts": {
@@ -19,27 +19,27 @@
     "buffer-equal": "^1.0.0",
     "gaussian": "^1.0.0",
     "mathjs": "^3.3.0",
-    "performance-now": "^0.2.0",
-    "serialport": "4.0.1",
+    "performance-now": "^2.1.0",
+    "serialport": "4.0.7",
     "sntp": "^2.0.0",
     "streamsearch": "^0.1.2"
   },
   "directories": {
     "test": "test"
   },
   "devDependencies": {
-    "bluebird": "3.4.6",
+    "bluebird": "3.5.0",
     "chai": "^3.4.1",
-    "chai-as-promised": "^5.2.0",
-    "codecov": "^1.0.1",
+    "chai-as-promised": "^6.0.0",
+    "codecov": "^2.1.0",
     "istanbul": "^0.4.4",
     "mocha": "^3.0.2",
     "sandboxed-module": "^2.0.3",
-    "semistandard": "^9.0.0",
-    "sinon": "^1.17.2",
+    "semistandard": "^10.0.0",
+    "sinon": "^2.1.0",
     "sinon-as-promised": "^4.0.2",
     "sinon-chai": "^2.8.0",
-    "snazzy": "^5.0.0"
+    "snazzy": "^6.0.0"
   },
   "repository": {
     "type": "git",