Added git ssh example to docs

Added a cli add git ssh dependency example to documentation for easy reference.

Release 1.0.8

Release 1.0.7

Release 1.0.6

* Fix resolution of path, url and VCS dependencies

* Fix editable installation of Poetry packages

doc: fix issue template links in CONTRIBUTING.md

Update shell completion docs for prezto

fix: Gracefully handle read-only sdists

For a package without dependencies in pypi's database, like p4python,
the sdist is required.  The problem is p4python was developed in
perforce where all files are read-only by default and deleting the temp
directory fails.

So we need to use the custom-built temp directory and specially handle
read-only files to be able to use p4python in poetry.

Fixes #520

Bump actions/cache from v1 to v2

Small improvements to docs for version command

Fixes https://github.com/python-poetry/poetry/issues/2048

Prior to this fix, when formatting PEP 508 dependency specification for
remote url references, the quoted marker was not prefixed with required
whitespace. This change ensures that the format adheres to the 
specified grammar.

Resolves: python-poetry/poetry#2326

Fix typo in docs

Your -> you

* fix incorrect parsing of spaces when parsing version constraints
* add tests for `parse_constraint`

Signed-off-by: oleg.hoefling <oleg.hoefling@gmail.com>

Co-Authored-By: Pradyun Gedam <pradyunsg@gmail.com>