Update version to 1.8.6 and add changelog informations

CHANGELOG.md

 # Develop -- TODO Change to 1.8.x.
 * ...
 
+# 1.8.6
+* IMPORTANT: This fixes a severe problem with postgresql in 1.8.5
+* SECURITY: Fix authentication bypass vulnerability
+* API: Update version to 1.2.15
+* FEATURE: Add copyPadWithoutHistory API (#4295) 
+* FEATURE: Package more asset files to save http requests (#4286)
+* MINOR: Improve UI when reconnecting
+* TESTS: Improve tests
+
 # 1.8.5
 * IMPORTANT DROP OF SUPPORT: Drop support for IE.  Browsers now need async/await.
 * IMPORTANT SECURITY: Rate limit Commits when env=production

src/package.json

@@ -95,6 +95,6 @@
     "test": "nyc wtfnode node_modules/.bin/_mocha --timeout 5000 --recursive ../tests/backend/specs ../node_modules/ep_*/static/tests/backend/specs",
     "test-container": "nyc mocha --timeout 5000 ../tests/container/specs/api"
   },
-  "version": "1.8.5",
+  "version": "1.8.6",
   "license": "Apache-2.0"
 }