Bump version to 1.5.7

libraries/logger/package.json

@@ -6,7 +6,7 @@
     "type": "git",
     "url": "http://github.com/sharelatex/logger-sharelatex.git"
   },
-  "version": "1.5.6",
+  "version": "1.5.7",
   "dependencies": {
     "bunyan": "1.5.1",
     "chai": "",