Update dependencies; release v2.7.2

package.json

 {
   "name": "service-runner",
-  "version": "2.7.1",
+  "version": "2.7.2",
   "description": "Generic nodejs service supervisor / cluster runner",
   "main": "service-runner.js",
   "bin": {
@@ -34,7 +34,7 @@
     "node": ">=4.2.2"
   },
   "dependencies": {
-    "bluebird": "^3.5.4",
+    "bluebird": "^3.5.5",
     "bunyan": "^1.8.12",
     "bunyan-syslog-udp": "^0.2.0",
     "dnscache": "^1.0.2",
@@ -42,12 +42,11 @@
     "hot-shots": "^6.3.0",
     "js-yaml": "^3.13.1",
     "limitation": "^0.2.1",
-    "npm-check-updates": "^3.1.9",
-    "semver": "^6.1.0",
+    "semver": "^6.1.2",
     "yargs": "^13.2.4"
   },
   "optionalDependencies": {
-    "gc-stats": "^1.3.0",
+    "gc-stats": "^1.4.0",
     "heapdump": "^0.3.14"
   },
   "devDependencies": {