use type for issue templates

Signed-off-by: Lukas Heumos <lukas.heumos@posteo.net>

Author: Zethson

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -2,8 +2,9 @@ name: Bug report
 description: ehrapy doesn’t do what it should? Please help us fix it!
 #title: ...
 labels:
-  - bug
   - triage
+type:
+  - Bug
 #assignees: []
 body:
   - type: checkboxes

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,6 +1,6 @@
 name: Feature request
 description: Propose a new feature for ehrapy
-labels: enhancement
+type: Enhancement
 body:
     - type: textarea
       id: description

tests/preprocessing/test_highly_variable_features.py

@@ -34,7 +34,7 @@ def test_highly_variable_features(clean_up_plots):
     assert "means" in adata.var.columns
     assert "variances" in adata.var.columns
     assert "variances_norm" in adata.var.columns
-
+    
     adata = ep.dt.dermatology(encoded=True)
     ep.pp.knn_impute(adata)
     highly_variable_features(adata, top_features_percentage=0.5)