[PATCH] requirements: Switch to compatible releases

[Stephen Finucane]

In commit ab0c443691, we switched from using commit ranges to fixed
ranges. This was a good idea in so far as it ensures we're providing an
application with dependencies that are guaranteed to work. However,
Patchwork as a project isn't active enough to warrant the continued busy
work effort necessary to keep bumping these versions and it's probably
about time to abandon the experiment. However, rather than switching
back to version ranges, use the compatible releases feature introduced
in PEP 440 [1]. This gives us most of the benefits of ranges but with a
nicer syntax.

[1] https://www.python.org/dev/peps/pep-0440/#compatible-release

Signed-off-by: Stephen Finucane <stephen at that.guru>
Cc: Daniel Axtens <dja at axtens.net>
---
 requirements-dev.txt  | 14 +++++++-------
 requirements-prod.txt | 14 +++++++-------
 requirements-test.txt | 10 +++++-----
 3 files changed, 19 insertions(+), 19 deletions(-)

diff --git a/requirements-dev.txt b/requirements-dev.txt
index 35ead6f9..ee0e10b6 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,8 +1,8 @@
-Django==2.2.5; python_version >= '3.5'
-Django==1.11.24; python_version < '3.0'  # pyup: ignore
-djangorestframework==3.9.2
-django-filter==2.1.0; python_version >= '3.5'
-django-filter==1.1.0; python_version < '3.0'  # pyup: ignore
-django-debug-toolbar==1.11
-django-dbbackup==3.2.0
+Django~=2.2; python_version >= '3.5'
+Django~=1.11; python_version < '3.0'  # pyup: ignore
+djangorestframework~=3.9
+django-filter~=2.1; python_version >= '3.5'
+django-filter~=1.1; python_version < '3.0'  # pyup: ignore
+django-debug-toolbar~=1.11
+django-dbbackup~=3.2
 -r requirements-test.txt
diff --git a/requirements-prod.txt b/requirements-prod.txt
index ba950f7a..92b44079 100644
--- a/requirements-prod.txt
+++ b/requirements-prod.txt
@@ -1,7 +1,7 @@
-Django==2.2.5; python_version >= '3.5'
-Django==1.11.24; python_version < '3.0'  # pyup: ignore
-djangorestframework==3.9.2
-django-filter==2.1.0; python_version >= '3.5'
-django-filter==1.1.0; python_version < '3.0'  # pyup: ignore
-psycopg2-binary==2.8.2
-sqlparse==0.3.0
+Django~=2.2; python_version >= '3.5'
+Django~=1.11; python_version < '3.0'  # pyup: ignore
+djangorestframework~=3.9
+django-filter~=2.1; python_version >= '3.5'
+django-filter~=1.1; python_version < '3.0'  # pyup: ignore
+psycopg2-binary~=2.8
+sqlparse~=0.3
diff --git a/requirements-test.txt b/requirements-test.txt
index 0ad3c8aa..ace4ec13 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1,5 +1,5 @@
-mysqlclient==1.3.14
-psycopg2-binary==2.8.2
-sqlparse==0.3.0
-python-dateutil==2.8.0
-openapi-core==0.8.0
+mysqlclient~=1.3.14
+psycopg2-binary~=2.8
+sqlparse~=0.3.0
+python-dateutil~=2.8
+openapi-core~=0.8
-- 
2.21.0