Editable install works again in recent pip

Author: amorison

Makefile

@@ -28,7 +28,7 @@ $(LINK): $(STAGPY)
 $(STAGPY): setup.py
 	$(PY) -m venv $(VENV_DIR)
 	$(VPIP) install -U pip
-	$(VPIP) install --no-use-pep517 -e .
+	$(VPIP) install -e .
 	@$(STAGPY) version
 
 info: infopath infozsh infobash

tox.ini

@@ -6,7 +6,7 @@ skipsdist=True
 [testenv]
 usedevelop=True
 deps =
-    pip==19.0.3
+    pip>=19.3.1
     pytest>=3.10
     pytest-cov>=2.6
 commands =