r19

* Upgrade build tools to Go 1.23. No major changes.

r18

* Update to latest pongo2 master which supports new "set" functionality.
* Add `replace` filter.

r17

* Add `--input-root-key`` parameter

  pongo2 enforces restrictions on the structure of top level context keys.
  This breaks JSON/YAML/other formats if they have regular dashes (-) in
  key names. The `--input-root-key` parameter puts the entire input
  file context under a common key, which allows it to function normally.

r16

* Fix environment variables not being pulled from environment.

r14

* Add `--directory-mode-filename-substr-del` command to make templating in directory mode easier. See README.md
  for details.

r13

* Fix GOOS format error from multi-platform releases.

(from r12)
* `--include-env` option to allow enviornment overrides of input files.

r10

* Add new filters:
    * `indent` - output data with the given indent. Can be given either a string or number of spaces.
    * `to_json` - outputs structured data as JSON. Supplying a parameter sets the indent.
    * `to_yaml` - outputs structured data as YAML.
    * `to_toml` - outputs structured data as TOML. Must be supplied a map.
    * `string` - convert input data to string (use with `from_base64`)
    * `bytes` - convert input data to bytes
    * `to_base64` - encode a string or bytes to base64
    * `from_base64` - decode a string from base64 to bytes
    * `to_gzip` - compress bytes with gzip (supply level as parameter, default 9)
    * `from_gzip` - decompress bytes with gzip

r9

* Fix not exiting when pre-requisites for directory mode not met.
* Filter bad environment variable names out when using environment variables. Other modes are unaffected.

r8

Release 8.

* Add `--directory-mode` which allows templating an entire folder of templates.
* Add SetMode, SetOwner and SetGroup folders to allow manipulating ownership
  and permissions on emitted files.
* See README.md for details on new usage.

r6

* Disable autoescape by default. It can be re-enabled with `--autoescape`.