Initial work for release of v0.6.1

Author: znicholls

Makefile

@@ -77,7 +77,7 @@ flake8: $(VENV_DIR)  ## check compliance with pep8
 black: $(VENV_DIR)  ## use black to autoformat code
 	@status=$$(git status --porcelain); \
 	if test "x$${status}" = x; then \
-		$(VENV_DIR)/bin/black --exclude _version.py --py36 $(FILES_TO_FORMAT_PYTHON); \
+		$(VENV_DIR)/bin/black --exclude _version.py --target-version py37 $(FILES_TO_FORMAT_PYTHON); \
 	else \
 		echo Not trying any formatting, working directory is dirty... >&2; \
 	fi;

setup.py

@@ -29,11 +29,7 @@
 REQUIREMENTS_DEPLOY = ["twine>=1.11.0", "setuptools>=38.6.0", "wheel>=0.31.0"]
 
 requirements_dev = [
-    *[
-        "flake8",
-        "black",
-        "pyam-iamc>=0.2.0",
-    ],
+    *["flake8", "black", "pyam-iamc>=0.2.0"],
     *REQUIREMENTS_TESTS,
     *REQUIREMENTS_DOCS,
     *REQUIREMENTS_DEPLOY,