docs: updated change logs (#194)

Author: parfeon

.pubnub.yml

@@ -1,6 +1,15 @@
 ---
 changelog:
-
+  -
+    changes:
+      -
+        text: "Add telemetry (latency) for all existing operation types."
+        type: feature
+      -
+        text: "Replace `cbor-sync` module with `cbor-js` for client implementation for web to fix compatibility with Salesforce Lightning Web Components."
+        type: bug
+    date: 2020-03-18
+    version: v4.27.4
   -
     changes:
       -

CHANGELOG.md

@@ -1,4 +1,10 @@
+## [v4.27.4](https://github.com/pubnub/javascript/releases/tag/v4.27.4)
+March-18-2020
 
+[Full Changelog](https://github.com/pubnub/javascript/compare/v4.27.3...v4.27.4)
+
+- 🌟️ Add telemetry (latency) for all existing operation types. 
+- 🐛 Replace `cbor-sync` module with `cbor-js` for client implementation for web to fix compatibility with Salesforce Lightning Web Components. 
 
 ## [v4.27.3](https://github.com/pubnub/javascript/tree/v4.27.3)
   January-06-2020