set tidelift (#310)

Add repository sponsorship links and security vulnerability form

set tidelift (#310)
4fa5269e · Oriol Abril-Pla · GitHub · 5795760d · 4fa5269e · 4fa5269e
--- a/.github/FUNDING.yml
+++ b/.github/FUNDING.yml
+github: numfocus
+tidelift: "pypi/aesara"
+custom: 'https://numfocus.org/donate-to-pymc3'
--- a/.github/SECURITY.md
+++ b/.github/SECURITY.md
+To report a security vulnerability to Aesara, please go to
+https://tidelift.com/security and see the instructions there.
+