pipenv: downgrade pandas to restore compatibility with python3.5

.travis.yml

@@ -24,6 +24,10 @@ env:
 # https://travis-ci.org/fphammerle/freesurfer-volume-reader/builds/525556257
 matrix:
   exclude:
+  # https://travis-ci.org/github/fphammerle/freesurfer-stats/jobs/683777317#L208
+  # https://github.com/pandas-dev/pandas/commit/18efcb27361478daa3118079ecb166c733691ecb#diff-2eeaed663bd0d25b7e608891384b7298R814
+  - python: 3.5
+    env: PANDAS_VERSION=1.*
   - python: 3.7
     env: PANDAS_VERSION=0.21.*
   - python: 3.7

Pipfile

@@ -5,6 +5,9 @@ name = "pypi"
 
 [packages]
 freesurfer-stats = {editable = true, path = "."}
+# v1.0.0 dropped support for python<3.6.1
+# https://github.com/pandas-dev/pandas/commit/18efcb27361478daa3118079ecb166c733691ecb#diff-2eeaed663bd0d25b7e608891384b7298R814
+pandas = "<1"
 
 [dev-packages]
 isort = "*"

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "f30f0d1204c23c90ad891593d8213ef0cd35fd90b574408aab7624f3cc1ee357"
+            "sha256": "6206232ea108ca4f8ae83e7d2c6afc1f9733a579a9bcb8da112d1bb6c4a9b7a3"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -48,24 +48,28 @@
         },
         "pandas": {
             "hashes": [
-                "sha256:07c1b58936b80eafdfe694ce964ac21567b80a48d972879a359b3ebb2ea76835",
-                "sha256:0ebe327fb088df4d06145227a4aa0998e4f80a9e6aed4b61c1f303bdfdf7c722",
-                "sha256:11c7cb654cd3a0e9c54d81761b5920cdc86b373510d829461d8f2ed6d5905266",
-                "sha256:12f492dd840e9db1688126216706aa2d1fcd3f4df68a195f9479272d50054645",
-                "sha256:167a1315367cea6ec6a5e11e791d9604f8e03f95b57ad227409de35cf850c9c5",
-                "sha256:1a7c56f1df8d5ad8571fa251b864231f26b47b59cbe41aa5c0983d17dbb7a8e4",
-                "sha256:1fa4bae1a6784aa550a1c9e168422798104a85bf9c77a1063ea77ee6f8452e3a",
-                "sha256:32f42e322fb903d0e189a4c10b75ba70d90958cc4f66a1781ed027f1a1d14586",
-                "sha256:387dc7b3c0424327fe3218f81e05fc27832772a5dffbed385013161be58df90b",
-                "sha256:6597df07ea361231e60c00692d8a8099b519ed741c04e65821e632bc9ccb924c",
-                "sha256:743bba36e99d4440403beb45a6f4f3a667c090c00394c176092b0b910666189b",
-                "sha256:858a0d890d957ae62338624e4aeaf1de436dba2c2c0772570a686eaca8b4fc85",
-                "sha256:863c3e4b7ae550749a0bb77fa22e601a36df9d2905afef34a6965bed092ba9e5",
-                "sha256:a210c91a02ec5ff05617a298ad6f137b9f6f5771bf31f2d6b6367d7f71486639",
-                "sha256:ca84a44cf727f211752e91eab2d1c6c1ab0f0540d5636a8382a3af428542826e",
-                "sha256:d234bcf669e8b4d6cbcd99e3ce7a8918414520aeb113e2a81aeb02d0a533d7f7"
+                "sha256:00dff3a8e337f5ed7ad295d98a31821d3d0fe7792da82d78d7fd79b89c03ea9d",
+                "sha256:22361b1597c8c2ffd697aa9bf85423afa9e1fcfa6b1ea821054a244d5f24d75e",
+                "sha256:255920e63850dc512ce356233081098554d641ba99c3767dde9e9f35630f994b",
+                "sha256:26382aab9c119735908d94d2c5c08020a4a0a82969b7e5eefb92f902b3b30ad7",
+                "sha256:33970f4cacdd9a0ddb8f21e151bfb9f178afb7c36eb7c25b9094c02876f385c2",
+                "sha256:4545467a637e0e1393f7d05d61dace89689ad6d6f66f267f86fff737b702cce9",
+                "sha256:52da74df8a9c9a103af0a72c9d5fdc8e0183a90884278db7f386b5692a2220a4",
+                "sha256:61741f5aeb252f39c3031d11405305b6d10ce663c53bc3112705d7ad66c013d0",
+                "sha256:6a3ac2c87e4e32a969921d1428525f09462770c349147aa8e9ab95f88c71ec71",
+                "sha256:7458c48e3d15b8aaa7d575be60e1e4dd70348efcd9376656b72fecd55c59a4c3",
+                "sha256:78bf638993219311377ce9836b3dc05f627a666d0dbc8cec37c0ff3c9ada673b",
+                "sha256:8153705d6545fd9eb6dd2bc79301bff08825d2e2f716d5dced48daafc2d0b81f",
+                "sha256:975c461accd14e89d71772e89108a050fa824c0b87a67d34cedf245f6681fc17",
+                "sha256:9962957a27bfb70ab64103d0a7b42fa59c642fb4ed4cb75d0227b7bb9228535d",
+                "sha256:adc3d3a3f9e59a38d923e90e20c4922fc62d1e5a03d083440468c6d8f3f1ae0a",
+                "sha256:bbe3eb765a0b1e578833d243e2814b60c825b7fdbf4cdfe8e8aae8a08ed56ecf",
+                "sha256:df8864824b1fe488cf778c3650ee59c3a0d8f42e53707de167ba6b4f7d35f133",
+                "sha256:e45055c30a608076e31a9fcd780a956ed3b1fa20db61561b8d88b79259f526f7",
+                "sha256:ee50c2142cdcf41995655d499a157d0a812fce55c97d9aad13bc1eef837ed36c"
             ],
-            "version": "==1.0.3"
+            "index": "pypi",
+            "version": "==0.25.3"
         },
         "python-dateutil": {
             "hashes": [