[ISSUE-28] Update preamp fetch (#29)

* updated preamp fetching code to match new fixed band eq file format

* minor improvement: parse preamp row before filters

* update README

* update README with link to latest release

* add boundary check on preamp fields

initial refactoring w/ new linters (#27)

Merge pull request #26 from indiependente/fix-string-trim

Revise parsing logic to trim fields

Upgrade Go version to 1.16.2; change filter

Added support for Apple Silicon

upgrade dependencies

First release