env: update dependencies to achieve compatibility with python3.8

$ pipenv sync --dev
[...]
ast3/Python/ast.c:22:1: error: conflicting types for _PyObject_FastCall
 _PyObject_FastCall(PyObject *func, PyObject *const *args, int nargs)
 ^~~~~~~~~~~~~~~~~~
In file included from /opt/hostedtoolcache/Python/3.8.0/x64/include/python3.8/abstract.h:837:0,
                 from /opt/hostedtoolcache/Python/3.8.0/x64/include/python3.8/Python.h:147,
                 from ast3/Python/ast.c:6:
/opt/hostedtoolcache/Python/3.8.0/x64/include/python3.8/cpython/abstract.h:145:1: note: previous definition of ‘_PyObject_FastCall’ was here
 _PyObject_FastCall(PyObject *func, PyObject *const *args, Py_ssize_t nargs)
 ^~~~~~~~~~~~~~~~~~
error: command 'gcc' failed with exit status 1

https://travis-ci.org/fphammerle/free-disk/jobs/630890038#L199

Pipfile.lock

@@ -24,65 +24,58 @@
     "develop": {
         "astroid": {
             "hashes": [
-                "sha256:6560e1e1749f68c64a4b5dee4e091fce798d2f0d84ebe638cf0e0585a343acf4",
-                "sha256:b65db1bbaac9f9f4d190199bb8680af6f6f84fd3769a5ea883df8a91fe68b4c4"
+                "sha256:71ea07f44df9568a75d0f354c49143a4575d90645e9fead6dfb52c26a85ed13a",
+                "sha256:840947ebfa8b58f318d42301cf8c0a20fd794a33b61cc4638e28e9e61ba32f42"
             ],
-            "version": "==2.2.5"
+            "version": "==2.3.3"
         },
-        "atomicwrites": {
+        "attrs": {
             "hashes": [
-                "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4",
-                "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"
+                "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c",
+                "sha256:f7b7ce16570fe9965acd6d30101a28f62fb4a7f9e926b3bbc9b61f8b04247e72"
             ],
-            "version": "==1.3.0"
+            "version": "==19.3.0"
         },
-        "attrs": {
+        "importlib-metadata": {
             "hashes": [
-                "sha256:69c0dbf2ed392de1cb5ec704444b08a5ef81680a61cb899dc08127123af36a79",
-                "sha256:f0b870f674851ecbfbbbd364d6b5cbdff9dcedbc7f3f5e18a6891057f21fe399"
+                "sha256:073a852570f92da5f744a3472af1b61e28e9f78ccf0c9117658dc32b15de7b45",
+                "sha256:d95141fbfa7ef2ec65cfd945e2af7e5a6ddbd7c8d9a25e66ff3be8e3daf9f60f"
             ],
-            "version": "==19.1.0"
+            "markers": "python_version < '3.8'",
+            "version": "==1.3.0"
         },
         "isort": {
             "hashes": [
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-                "sha256:268067462aed7eb2a1e237fcb287852f22077de3fb07964e87e00f829eea2d1a"
+                "sha256:54da7e92468955c4fceacd0c86bd0ec997b0e1ee80d97f67c35a78b719dccab1",
+                "sha256:6e811fcb295968434526407adb8796944f1988c5b65e8139058f2014cbe100fd"
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-            "version": "==4.3.17"
+            "version": "==4.3.21"
         },
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+            "version": "==1.4.3"
         },
         "mccabe": {
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@@ -93,80 +86,107 @@
         },
         "more-itertools": {
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-            "markers": "python_version > '2.7'",
-            "version": "==7.0.0"
+            "version": "==8.0.2"
+        },
+        "packaging": {
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     }
 }