Update dependencies and Go version to 1.17.
Add new custom functions: cidrHost, cidrNetmask, cidrSubnets and cidrSubnetSizes

• update crypt to v0.2.5 (fixes upstream bug VirtusLab/crypt@c86675a)
• update sprig to v2.22.0

Changes:

• add slack notifications for travis ci
• bump go version to 1.13
• add tarballs to releases
• add snapcraft file

Changes:

• add silent mode --silent, -s
• avoid confusing error messages when empty --config or --var is passed
• update sprig dependency

Changes:

• add n template function
• fix .gitignore

Changes:

• add custom functions: fromYaml, fromJson, jsonPath, writeFile
• update .travis.yml

Changes:

• disable git signing because it always breaks when needed
• update crypt to v0.1.1
• improve error handling logging
• improve logging
• update Makefile, remove config.env
• update README.md

Minor logging/error handling fixes.

Changes:

• update Makefile, add set_exit_status for golint
• fix main_test.go after go-extended version bump-
• add version info to logs
• add regression test for #11
• simplify logging in main.go
• update go-extended dependency to version v0.0.4
• add version info to logs
• add a test case, sort imports