Add Zmpl language syntax

[uzyn]

• I'm the package's author and/or maintainer.
• I have have read [the docs][1].
• I have tagged a release with a [semver][2] version number.
• My package repo has a description and a README describing what it's for and how to use it.
• My package doesn't add context menu entries. *
• My package doesn't add key bindings. **
• Any commands are available via the command palette.
• Preferences and keybindings (if any) are listed in the menu and the command palette, and open in split view.
• If my package is a syntax it doesn't also add a color scheme. ***
• If my package is a syntax it is named after the language it supports (without suffixes like "syntax" or "highlighting").
• I use [.gitattributes][3] to exclude files from the package: images, test files, sublime-project/workspace.

My package is Zmpl and it adds Zmpl language syntax highlighting.

There are no packages like it in Package Control.

[packagecontrol-bot]

Automated testing result: ERROR

Repo link: Zmpl
Results help

Packages added:
  - Zmpl

Processing package "Zmpl"
  - ERROR: Branch-based releases are not supported for new packages; please use "tags": true
  - WARNING: '.sublime-syntax' support has been added in build 3092 and there is no '.tmLanguage' fallback file
    - File: syntaxes/zmpl.sublime-syntax

[packagecontrol-bot]

Automated testing result: ERROR

Repo link: Zmpl
Results help

Packages added:
  - Zmpl

Processing package "Zmpl"
  - ERROR: Branch-based releases are not supported for new packages; please use "tags": true
  - WARNING: '.sublime-syntax' support has been added in build 3092 and there is no '.tmLanguage' fallback file
    - File: syntaxes/zmpl.sublime-syntax

[uzyn]

PR is now updated. Thanks @packagecontrol-bot