update to go 1.20 and use go.work for visual code

.gitignore

+main
+go*
+*.pb.go
+.DS_Store

.vscode/launch.json

+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileDirname}"
+        }
+    ]
+}
\ No newline at end of file

go.work

+go 1.20
+
+use ./src/gocat
+use ./src/gofabric
+use ./src/gojoke
+use ./src/gomd5
+use ./src/gopalindrome
+use ./src/gopraha
+use ./src/goproxy
+use ./src/gouni
+use ./src/gourl
+use ./src/hello-grpc/client
+use ./src/hello-grpc/server
+use ./src/hello-kafka

src/gocat/go.mod

 module github.com/turngeek/examples-go/src/gocat
 
-go 1.16
+go 1.20

src/gofabric/go.mod

+module github.com/turngeek/examples-go/src/gofabric
+
+go 1.20

src/gojoke/go.mod

 module github.com/turngeek/examples-go/src/gojoke
 
-go 1.16
+go 1.20

src/gopalindrome/go.mod

 module github.com/turngeek/examples-go/src/gopalindrome
 
-go 1.16
+go 1.20

src/gopraha/go.mod

 module github.com/turngeek/examples-go/src/gopraha
 
-go 1.16
+go 1.20
 
 require github.com/segmentio/kafka-go v0.4.16 // indirect

src/goproxy/go.mod

 module github.com/turngeek/examples-go/src/goproxy
 
-go 1.16
+go 1.20
 
 require github.com/gorilla/mux v1.8.0 // indirect

src/gouni/go.mod

 module github.com/turngeek/examples-go/src/gouni
 
-go 1.16
+go 1.20

src/gourl/go.mod

 module github.com/turngeek/examples-go/src/gourl
 
-go 1.16
+go 1.20

src/hello-grpc/client/go.mod

 module github.com/turngeek/examples-go/src/hello-grpc/client
 
-go 1.16
+go 1.20
 
 require (
 	golang.org/x/net v0.0.0-20210525063256-abc453219eb5 // indirect

src/hello-grpc/server/go.mod

 module github.com/turngeek/examples-go/src/hello-grpc/server
 
-go 1.16
+go 1.20
 
 require (
 	golang.org/x/net v0.0.0-20210525063256-abc453219eb5 // indirect

src/hello-kafka/go.mod

 module github.com/turngeek/examples-go/src/hello-kafka
 
-go 1.16
+go 1.20
 
 require github.com/segmentio/kafka-go v0.4.16 // indirect