v0.7.0

• Add some additional validations of config for better error messages
• Add --directory (-d) flag to selectively sync a directory
  • This flag supersedes --use-directory flag which was forcing sync of all directories with local overrides
  • [breaking] Removed --use-directory flag
• Fail if directory is empty because all files were filtered out

8c753b9efda146171b511c6e8d9964c8dee7dd43320d468e600f47413d990287  ./vendir-darwin-amd64
58c09e2b22e8bc2136534405f5e76a544cfac3a57d165670ab3fcfb18cb3e604  ./vendir-linux-amd64
984fd912ea37b7f753c87aa727f3020296038e789e30c973f6ad23436fd136bb  ./vendir-windows-amd64.exe

(Installation instructions: https://k14s.io/#install-from-github-release)