Mypy-boto3-builder

Fixed
- `[boto3-stubs]` Added `boto3.s3.inject` module stubs
- `[boto3-stubs]` Allow `boto3.session.Session` usage (reported by sarisia in 160)

Fixed
- Allow `from boto3 import Session` (reported by kingakimbrel in 160)

Changed
- `[botocore-stubs]` Is no longer generated, moved to [botocore-stubs](https://github.com/youtype/botocore-stubs) repository

Fixed
- `[types-aiobotocore]` Invalid imports in `httpsession` module

Fixed
- `[boto3-stubs]` No longer provides a module interface
- `[botocore-stubs]` No longer provides a module interface
- `[lambda]` `InvocationResponseTypeDef` hack removed, now correctly parsed as a response structure (reported by mew1033 in 159)
- `[sqs]` `AttributeNames` argument in many methods accepted wrong values due to a bug in `botocore` (reported by ngnpope in 158)
- `[builder]` Generated `setup.py` files have proper docstrings

Fixed
- `[types-aiobotocore]` `boto3.dynamodb.conditions.ConditionBase` import no longer fails if `boto3` is not installed

Notes

We are so close to **3 million** monthly downloads! To make this challenge a bit harder, this version drops outdated `py36` support. For good. It is now gone, it is not coming back. Please upgrade. I mean it.

Thank you as always for your bug reports and feature requests!

Changed
- `[boto3-stubs]` Dropped `py36` support
- `[types-aiobotocore]` Dropped `py36` support
- `[types-aioboto3]` Dropped `py36` support
- `[builder]` Added `LICENSE` file to all packages

Fixed
- `[botocore-stubs]` Removed `ETree` imports
- `[types-aiobotocore]` Imports from `boto3` and `aioboto3` are now safe in case libraries are not installed
- `[types-aioboto3]` Use `AIOBoto3ServiceResource` as a base class instead of `ServiceResource`
- `[types-aioboto3]` Use `AIOResourceCollection` as a base class instead of `ResourceCollection`