docs: fix build instructions in README.md

fix: use git fetch & git reset instead of git pull

docs: change deprecated argument warning

chore: move go files to src/gitwatcher

refactor: logError

docs: change systems to platforms

feat: put a newline symbol after command

fix: change module name from main to github.com/KD3n1z/gitwatcher

chore: remove 'alias' from makefile

docs: change 'Installing' to 'Installation'

chore: fix GOARCH in makefile

feat: auto check for updates

fix: error logging to stderr

bugfix

bugfix