Upgrade dependencies

package.json

@@ -8,30 +8,30 @@
     "babel-preset-es2015": "^6.6.0",
     "babel-preset-react": "^6.5.0",
     "babel-preset-stage-1": "^6.5.0",
-    "front-matter": "^2.0.6",
+    "front-matter": "^2.0.7",
     "gatsby": "^0.9.0",
-    "highlight.js": "^9.2.0",
-    "history": "^2.0.1",
-    "js-yaml": "^3.5.5",
-    "markdown-it": "^6.0.0",
+    "highlight.js": "^9.3.0",
+    "history": "^2.0.2",
+    "js-yaml": "^3.6.0",
+    "markdown-it": "^6.0.1",
     "markdown-it-abbr": "^1.0.3",
     "markdown-it-attrs": "^0.1.8",
     "markdown-it-deflist": "^2.0.1",
     "markdown-it-footnote": "^2.0.0",
     "markdown-it-sub": "^1.0.0",
     "object-assign": "^4.0.1",
     "react-document-title": "^2.0.1",
-    "react-headroom": "^1.8.0",
-    "react-responsive-grid": "^0.3.0",
-    "react-router": "^2.0.1",
+    "react-headroom": "^1.8.1",
+    "react-responsive-grid": "^0.3.2",
+    "react-router": "^2.2.4",
     "toml-js": "0.0.8",
     "typography": "^0.7.0"
   },
   "devDependencies": {
     "babel-preset-react-hmre": "^1.1.1",
-    "eslint": "^2.4.0",
-    "eslint-config-airbnb": "^6.1.0",
-    "eslint-plugin-react": "^4.2.1"
+    "eslint": "^2.8.0",
+    "eslint-config-airbnb": "^7.0.0",
+    "eslint-plugin-react": "^4.3.0"
   },
   "keywords": [
     "gatsby"