Update to mq-golang v5.1.2 for MQ 9.2 client

• Update to MQ 9.2 client and re-test
• Fix broken links in readme files

Update to mq-golang v5.0.0 for Go Modules

• Pick up mq-golang support for Go modules at v5.0.0
• Also brings in a pre-req for Golang v1.13

Switch to "go mod" for dependencies

Adopt "go mod" for dependency management.

First release - uses dep for dependencies

Includes support for;

• client connections to queue managers
• local bindings connections to queue managers
• anonymous TLS and mutual TLS connections to queue managers
• receiveNoWait and receive with wait
• text messages (only)
• persistent and non-persistent messages
• get by correlation ID
• request/reply messaging pattern
• expiring messages with time to live

Uses "dep" for dependency management.