dev env: fix ineffective numpy version constraint

Pipfile

@@ -6,6 +6,10 @@ name = "pypi"
 [packages]
 freesurfer-surface = {editable = true, path = "."}
 
+# python3.5 compatibility
+# https://github.com/numpy/numpy/commit/fbcb58ca2c17217f5dc85cb669ea651b7799b60c#diff-60f61ab7a8d1910d86d9fda2261620314edcae5894d5aaa236b821c7256badd7R30
+numpy = "<1.19"
+
 [dev-packages]
 pylint = ">=2.3.0"
 pytest = "*"
@@ -14,8 +18,6 @@ pytest-cov = "*"
 
 # python3.5 compatibility
 isort = "<5"
-# https://github.com/numpy/numpy/commit/fbcb58ca2c17217f5dc85cb669ea651b7799b60c#diff-60f61ab7a8d1910d86d9fda2261620314edcae5894d5aaa236b821c7256badd7R30
-numpy = "<1.19"
 # workaround https://github.com/pytest-dev/pytest/issues/3953
 pathlib2 = {version = "*", markers="python_version < '3.6'"}
 # https://github.com/jaraco/zipp/commit/05a3c52b4d41690e0471a2e283cffb500dc0329a

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
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         },
         "pipfile-spec": 6,
         "requires": {
@@ -22,34 +22,30 @@
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-            "version": "==1.19.2"
+            "index": "pypi",
+            "version": "==1.18.5"
         }
     },
     "develop": {
@@ -161,37 +157,6 @@
             ],
             "version": "==0.6.1"
         },
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