Travis build failing - Makefile error

[lillchan]

Describe the bug

See failing build: https://travis-ci.org/github/dikhan/terraform-provider-openapi/jobs/669808435

Travis is failing with the following error:

0.03s$ env GO111MODULE=on make release-version
/bin/sh: 1: Syntax error: ")" unexpected
make: *** [release-pre-requirements] Error 2
The command "env GO111MODULE=on make release-version" exited with 2.

To Reproduce

Travis attempts to run make release-pre-requirements and exercises branch ifeq (, $(shell which github-release-notes)) (github-release-notes is not already installed)

Expected behaviour

Travis should be able to run make release-pre-requirements without error

Additional context

This is blocking release of #209

Checklist (for admin only)

Don't forget to go through the checklist to make sure the issue is created properly:

• [x] I have added a corresponding label (bug) to the issue (right side menu)
• [x] I have added this issue to the 'API Terraform Provider' GitHub project (right side menu)