v3.19.0

Added:

• noarch packages that cannot be built on linux_64 can be configured to build
  on one or more noarch_platforms in conda-forge.yml

Changed:

• Default provider for aarch64 and pcp64le is now Travis-CI

Fixed:

• Travis CI badge in readme uses correct url and linux image

Authors:

• Isuru Fernando
• Matthew R. Becker
• Nicholas Bollweg
• Sylvain Corlay