v8.0.3: fix(project): fix terser package version

[homer0]

What does this PR do?

Since #63 , the project is using terser-webpack-plugin to minify the files. The plugin requires terser@^4.0.0, the core library that actually does the whole thing.

A few hours ago, terser@4.0.1 was released... with a bug on the source map generation; this causes webpack to silently exit without any error nor notification.

Forcing the project to install terser@4.0.0 seems to fix the issue.

I'll keep an eye for when it gets fixed and I'll remove the dependency.

How should it be tested manually?

Try to build a project for production using master and this branch.

[coveralls]

Pull Request Test Coverage Report for Build 254

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 251:	0.0%
Covered Lines:	604
Relevant Lines:	604

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💛 - Coveralls