Release 1.6.1

Security fix for header validation. See GHSA-wjfc-pgfp-pv9c

What's Changed

See change log for changes.

What's Changed

• [CI] Remove scutinizer by @Nyholm in #231
• [CI] Just some code style changes by @Nyholm in #232
• [CI] Remove badge for Travis by @Nyholm in #233
• [CS] native_function_invocation by @Nyholm in #235
• Added change log for 1.6.1 by @Nyholm in #236

Full Changelog: 1.6.0...1.6.1