Updates for LB3 release

* Update package.json publishConfig

* Add note to README.md

README.md

@@ -2,6 +2,19 @@
 
 Browse and test your LoopBack app's APIs.
 
+## Supported versions
+
+Current|Long Term Support
+:-:|:-:
+4.x|2.x
+
+Learn more about our LTS plan in [docs](http://loopback.io/doc/en/contrib/Long-term-support.html).
+
+*The only difference between 3.x and 4.x versions is which Node.js versions
+are supported (loopback-component-explorer 4.x dropped support for pre-v4
+versions of Node.js). Therefore we decided to not maintain 3.x version line and
+provide LTS support for the 2.x version line instead.*
+
 ## Basic Usage
 
 Below is a simple LoopBack application. The explorer is mounted at `/explorer`.

package.json

@@ -1,9 +1,6 @@
 {
   "name": "loopback-component-explorer",
-  "version": "4.0.0-alpha.1",
+  "version": "4.0.0",
-  "publishConfig": {
-    "tag": "next"
-  },
   "description": "Browse and test your LoopBack app's APIs",
   "engines": {
     "node": ">=4"