python.pkgs.flask_migrate: 1.7.0 -> 2.0.3

fixes build against new dependencies after some test tinkering, seems
we can remove the python3-patching as there exists a "python" symlink now

pkgs/development/python-modules/flask-migrate/default.nix

@@ -0,0 +1,29 @@
+{ stdenv, buildPythonPackage, fetchPypi, isPy3k, python, glibcLocales, flask, flask_sqlalchemy, flask_script, alembic
+}:
+
+with stdenv.lib;
+
+buildPythonPackage rec {
+  pname = "Flask-Migrate";
+  version = "2.0.3";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "107x78lkqsnbg92dld3dkagg07jvchp3ib3y0sivc4ipz6n1y7rk";
+  };
+
+  checkInputs = optional isPy3k glibcLocales;
+  propagatedBuildInputs = [ flask flask_sqlalchemy flask_script alembic ];
+
+  # tests invoke the flask cli which uses click and therefore has py3k encoding troubles
+  preCheck = optionalString isPy3k ''
+    export LANG="en_US.UTF-8"
+  '';
+
+  meta = {
+    description = "SQLAlchemy database migrations for Flask applications using Alembic";
+    license = licenses.mit;
+    homepage = https://github.com/miguelgrinberg/Flask-Migrate;
+  };
+}