Merge pull request esphome#817 from esphome/bump-1.15.3

1.15.3

Merge pull request esphome#776 from esphome/bump-1.15.2

1.15.2

Merge pull request esphome#762 from esphome/bump-1.15.1

1.15.1

Merge pull request esphome#758 from esphome/bump-1.15.0

1.15.0

Merge pull request esphome#744 from esphome/bump-1.15.0b4

1.15.0b4

Merge pull request esphome#722 from esphome/bump-1.15.0b3

1.15.0b3

Merge pull request esphome#717 from esphome/bump-1.15.0b2

Merge pull request esphome#712 from esphome/bump-1.15.0b1

Update pip to pip3 (esphome#703)

Changing the instruction of "pip install" to "pip3 install" instead, due to the warning: "You're using ESPHome with python 2. Support for python 2 is deprecated and will be removed in 1.15.0. Please reinstall ESPHome with python 3.6 or higher."

Bump version to v1.14.4