fix(fix-request-body): improve content type check

[kevinxh]

Description

It is common for POST request to have the content type: application/x-www-form-urlencoded; charset=UTF-8

The charset part can be set when you have a form with attribute accept-charset="utf-8"

I encountered this while using the fixRequestBody function and the content type check doesn't take the charset into account.

Motivation and Context

How has this been tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[chimurai]

Hi, thanks for the PR.

Looks like a good improvement.

[coveralls]

Coverage remained the same at 98.86% when pulling 1c5bd04 on kevinxh:fix-request-body-update into e9e25ca on chimurai:master.

[chimurai]

Thanks for making the PR @kevinxh!

Published fix in v2.0.4