chore: v6.0.0-beta.19 [skip ci]

Author: aminya

Diff for: README.md

@@ -40,7 +40,7 @@
 Install **ZeroMQ.js** with prebuilt binaries:
 
 ```sh
-npm install zeromq@6.0.0-beta.18
+npm install zeromq@6.0.0-beta.19
 ```
 
 Requirements for using prebuilt binaries:
@@ -78,20 +78,20 @@ Make sure you have the following installed before attempting to build from sourc
 To install from source:
 
 ```sh
-npm install zeromq@6.0.0-beta.18 --build-from-source
+npm install zeromq@6.0.0-beta.19 --build-from-source
 ```
 
 If you want to link against a shared ZeroMQ library, you can build skip downloading `libzmq` and link with the
 installed library instead as follows:
 
 ```sh
-npm install zeromq@6.0.0-beta.18 --zmq-shared
+npm install zeromq@6.0.0-beta.19 --zmq-shared
 ```
 
 If you wish to use any DRAFT sockets then it is also necessary to compile the library from source:
 
 ```sh
-npm install zeromq@6.0.0-beta.18 --zmq-draft
+npm install zeromq@6.0.0-beta.19 --zmq-draft
 ```
 
 ## Examples

Diff for: package.json

@@ -1,6 +1,6 @@
 {
   "name": "zeromq",
-  "version": "6.0.0-beta.18",
+  "version": "6.0.0-beta.19",
   "description": "Next-generation ZeroMQ bindings for Node.js",
   "main": "lib/index.js",
   "types": "lib/index.d.ts",