Documentation published to https://cs01.github.io/pygdbmi/ is out of date

**Describe the bug**
The published documentation is out of date. For example, the "Programmatic Control Over gdb" section referencesget_subprocess_cmd() which no longer exists. The readme file located at: https://github.com/cs01/pygdbmi/tree/v0.11.0.0/docs is updated, however.

**To Reproduce**
View https://cs01.github.io/pygdbmi/

**Expected behavior**
Documentation reflects current release

**Screenshots**
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**Please complete the following information:**
* OS: N/A
* pygdbmi version (`pip freeze` output): 0.11.0.0

**Additional context**
Add any other context about the problem here.