Bump version: 0.3.13 -> 0.4.0

[casey]

Technically the addition of aliases was a breaking change, since a recipe named alias with no arguments will be parsed differently, so bumping the minor version.

[casey]

v0.4.0 is released!

It comes with a few goodies, in particular

• Recipe aliases by @ryloric, Adding an alias syntax extension, so that a shorter version can be provided for recipes #390:

# recipe `build` can also be invoked with `b`
alias b = build

build:
  echo 'Building!'

• Arbitrary expressions as default arguments, Allow arbitrary expressions as default arguments #400:

foo bar=`cat baz`:
  echo {{bar}}

• Allow outer shebang lines so justfiles can be used as scripts (Allow outer shebangs so justfiles can be used as scripts #393):

#!/usr/bin/env just --justfile

foo:
  echo 'Foo!'

• Allow --justfile without --working-directory by @smonami (Allow --justfile without --working-directory #392), which was needed for the above.

• And since last release, a Chinese translation of the readme was made by @chinanf-boy (Add link to Chinese translation of readme #377)

Thanks so much to everyone who contributed!