update rtd.yml file

Signed-off-by: foamyguy <foamyguy@gmail.com>

Merge pull request #101 from FoamyGuy/displayio_api_updates

displayio API update

Merge pull request #100 from carlossless/binary-pbm-width-fix

fix padded pbm binary loading

Merge pull request #99 from justmobilize/remove-secrets-usage

Remove secrets usage

Merge pull request #98 from Neradoc/add-filters-indexed-png

Implement filters for indexed PNG

Merge pull request #96 from FoamyGuy/indexerror_fix

Guard against out of bounds pixel set

Merge pull request #94 from FoamyGuy/png_load_test

load png test case

add sphinx configuration to rtd.yaml

Signed-off-by: foamyguy <foamyguy@gmail.com>

Merge pull request #92 from FoamyGuy/move_prev_line_swap

move prev,line swap to after putting data into bitmap

Merge pull request #90 from FoamyGuy/colorconvert_in_docstring

Colorconvert in docstring