Pin dependencies

package-lock.json

@@ -2379,11 +2379,6 @@
       "resolved": "https://registry.npmjs.org/markdown-it-emoji/-/markdown-it-emoji-1.4.0.tgz",
       "integrity": "sha1-m+4OmpkKljupbfaYDE/dsF37Tcw="
     },
-    "markdown-it-linkify-images": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/markdown-it-linkify-images/-/markdown-it-linkify-images-1.1.0.tgz",
-      "integrity": "sha1-xVedk4bXcgxUbPWD/glq3FmAyFk="
-    },
     "markdown-it-mark": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/markdown-it-mark/-/markdown-it-mark-2.0.0.tgz",

package.json

@@ -6,7 +6,7 @@
     "start": "node ./bin/www"
   },
   "dependencies": {
-    "connect-pg-simple": "^5.0.0",
+    "connect-pg-simple": "5.0.0",
     "cookie-parser": "1.4.4",
     "debug": "4.1.1",
     "express": "4.16.4",
@@ -18,14 +18,14 @@
     "graphql-import": "0.7.1",
     "http-errors": "1.7.2",
     "js-yaml": "latest",
-    "markdown-it": "^8.4.2",
-    "markdown-it-emoji": "^1.4.0",
-    "markdown-it-mark": "^2.0.0",
-    "markdown-it-math": "^4.1.1",
-    "markdown-it-smartarrows": "^1.0.1",
+    "markdown-it": "8.4.2",
+    "markdown-it-emoji": "1.4.0",
+    "markdown-it-mark": "2.0.0",
+    "markdown-it-math": "4.1.1",
+    "markdown-it-smartarrows": "1.0.1",
     "morgan": "1.9.1",
     "node-sass": "4.12.0",
-    "pg": "^7.11.0",
+    "pg": "7.11.0",
     "pug": "2.0.3"
   }
 }