v0.26.0

• Add examples/helm-ytt-post-renderer
• Add a proposals folder with some notes about first proposal: schemas
• Support accessing yamlfragments with accessors similar to maps and arrays (docs)
• Allow to access to yamlfrag functionality within overlay/match or overlay/replace
• Fix panic on errors from line 1 of .star files
• Error early if a @ytt library module is not found
• Add ytt library for asserting on minimum ytt version (docs)
• Plumb matching multiple map items (docs)
• Support + to indicate missing_ok within data values passed in via cmd line args
• Use overlay/replace for each data value specified in cmd line or env var
• Add overlay.(and|or|not)_op to support basic logic operations
• Allow process substitution as file input on linux even though it is a non-existent symlink
• Support various output formats via -o for --data-values-inspect and --files-inspect results
• Switch to go modules
• Add --version flag in addition to version cmd
• --output-directory flag now creates destination directory entirely before creating it again

Improvements to error messages:

• hint user at upgrading ytt if builtin ytt library module is missing
• hint about having extra end keyword
• hint problem with null/nil/none vs None
• hint at missing ":" after if/for/def
• hint problem with true/false vs True/False
• improve error message for loading non-library files
• hint at getattr(...) for struct field programmatic access
• when overlay fails expectations, report position of matches
• improve text templating error message hinting to use str(...)

9275cd3033ec0276d0428cb73d4b5de87720491fc3261a1183a14d9344d8bfc6  ./ytt-darwin-amd64
ea740f72a1825c00eabf83bfd6cb366adf4b2486992603d6850fac8487e92d8f  ./ytt-linux-amd64
1bc2d856ebc5b3d4085fbf470b5793ddc551dff9325458d801e4b9202c2fbb20  ./ytt-windows-amd64.exe

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