Merge pull request #2948 from python-poetry/release-1.1.0b4

Bump version to 1.1.0b4

CHANGELOG.md

 # Change Log
 
+## [1.1.0b4] - 2020-09-23
+
+### Changed
+
+- When running under Python 2.7 on Windows, install command will be limited to one worker to mitigate threading issue ([#2941](https://github.com/python-poetry/poetry/pull/2941)).
+
+
 ## [1.1.0b3] - 2020-09-18
 
 ### Changed

poetry/__version__.py

-__version__ = "1.1.0b3"
+__version__ = "1.1.0b4"

pyproject.toml

 [tool.poetry]
 name = "poetry"
-version = "1.1.0b3"
+version = "1.1.0b4"
 description = "Python dependency management and packaging made easy."
 authors = [
     "Sébastien Eustace <sebastien@eustace.io>"