fix(addOn): check state before executing underlying client instance functions (#338)

* fix(addOn): check state before executing underlying client instance functions

* docs(prebuild instructions): change outdated text

* add Node.js 20 prebuild for Mac OS X M1

* add Node.js 18 prebuild for Mac OS X M1

* add Node.js 18 prebuild for Mac OS X x86

* add Node.js 20 prebuild for Mac OS X x86

* add prebuilds for Windows

Author: DavidVujic

prebuilds/README.md

@@ -1,23 +1,22 @@
 ### Prebuilds
 
 Currently, there are prebuilt Node.js AddOns for Mac OS X and Windows. 
-Each platform has prebuilds for Node.js 12 and 14.
 
 
 #### Creating prebuilds
 Create prebuilds for Mac OS X:
 
 ```bash
-npx prebuildify --arch x64 --platform darwin --target 20.10.0
+npx prebuildify --arch x64 --platform darwin --target 20.11.0
 ```
 
-Prebuilds for Mac OS X with the M1 processor:
+Prebuilds for Mac OS X with the M1/M2/M3 processor:
 ```bash
-npx prebuildify --arch arm64 --platform darwin --target 20.10.0
+npx prebuildify --arch arm64 --platform darwin --target 20.11.0
 ```
 
 Create prebuilds for Windows:
 
 ```bash
-npx prebuildify --arch x64 --platform win32 --target 20.10.0
+npx prebuildify --arch x64 --platform win32 --target 20.11.0
 ```

prebuilds/darwin-arm64/node.abi108.node

@@ -609,7 +609,7 @@ class ZooKeeper: public Nan::ObjectWrap {
         Nan::SetPrivate(cb->GetFunction(), Nan::New(PRIVATE_PROP_ZK), zk->handle()); \
 
 #define METHOD_EPILOG(call) \
-        int ret = (call); \
+        int ret = (zk->zhandle ? (call) : ZINVALIDSTATE); \
         RETURN_VALUE(info, Nan::New<Int32>(ret))
 
 #define WATCHER_PROLOG(info) \