Remove/upgrade some dependencies

package.json

@@ -24,19 +24,16 @@
   "devDependencies": {
     "@ember/test-helpers": "^0.7.18",
     "broccoli-asset-rev": "^2.5.0",
-    "ember-ajax": "^3.1.0",
-    "ember-block-slots": "^1.1.11",
     "ember-cli": "~3.0.0",
     "ember-cli-addon-docs": "^0.3.0",
     "ember-cli-addon-docs-yuidoc": "^0.1.0",
-    "ember-cli-dependency-checker": "^2.0.1",
+    "ember-cli-dependency-checker": "^2.1.0",
     "ember-cli-deploy": "^1.0.2",
     "ember-cli-deploy-build": "^1.1.1",
     "ember-cli-deploy-git": "^1.3.2",
     "ember-cli-deploy-git-ci": "^1.0.1",
     "ember-cli-document-title": "^0.3.3",
     "ember-cli-eslint": "^4.2.3",
-    "ember-cli-github-pages": "0.1.2",
     "ember-cli-inject-live-reload": "^1.7.0",
     "ember-cli-qunit": "^4.3.2",
     "ember-cli-shims": "^1.2.0",
@@ -46,7 +43,7 @@
     "ember-cli-uglify": "^2.0.0",
     "ember-composable-helpers": "^2.1.0",
     "ember-concurrency": "^0.8.16",
-    "ember-css-modules": "^0.7.2",
+    "ember-css-modules": "^0.7.10",
     "ember-disable-prototype-extensions": "^1.1.3",
     "ember-export-application-global": "^2.0.0",
     "ember-hook": "^1.4.2",
@@ -57,7 +54,7 @@
     "ember-resolver": "^4.3.0",
     "ember-source": "~3.0.0",
     "ember-source-channel-url": "^1.0.1",
-    "ember-truth-helpers": "^1.3.0",
+    "ember-truth-helpers": "^2.0.0",
     "ember-try": "^0.2.23",
     "eslint": "^4.5.0",
     "eslint-config-prettier": "^2.3.0",
@@ -71,7 +68,7 @@
   },
   "dependencies": {
     "debug": "^2.6.8",
-    "ember-cli-babel": "^6.7.2",
+    "ember-cli-babel": "^6.12.0",
     "ember-cli-htmlbars": "^2.0.3",
     "ember-cli-htmlbars-inline-precompile": "^1.0.1"
   },