Release v0.3.4

Changes:

• Allow changing the output filenames.

  Read the docs for instructions.

• Move more logic to the default template from methods.

  Many methods were removed from OutputGenerator class. If you are using a custom template and depend on any of them, please update it. I'd suggest basing it off the new default template.

• Create the output directory recursively.

  This allows the user to choose /dir1/dir2/dir3/ as the output directory, even if only /dir1 exists.

• Remove extension configuration option.

  The same functionality can now be achieved using the new filename setting.

• Remove time configuration option.

  The same functionality can now be achieved by using a simple custom template.

• Fix warnings on systems with the erb gem installed.

• Drop ruby < 2.7 support (EOL).

• Refactors, reorganization of the repo, improvement on the default template and on the docs.