v0.3.0

Added support for variables (#2)

Variables can be declared with the `declare` keyword:

    declare my-var as text

At the moment, only `text` type is supported.

The default value will be empty, you can set the value with:

    set my-var to "hello"

v0.2.0

Added comments (#1)

Comments start with a `#` and continue until a new line or the end of the program is reached. The comment may be on its own line or at the end of a sentence.

v0.1.0

Hello, World!

The parser and engine is built, although it only supports one sentence with "display".