Use latest amber version on recipes

[faustinoaq]

Currently recipes are using:

dependencies:
  amber:
    github: amberframework/amber
    branch: master
    #version: {{ amber_version }}

Once amber v0.8.0 is released we should change this to:

dependencies:
  amber:
    github: amberframework/amber
    # branch: master
    version: {{ amber_version }}