Bump onecodex to v0.18.0

Author: alenajk

requirements.txt

@@ -8,6 +8,6 @@ nbconvert==6.5.0
 openpyxl==3.0.3
 xlrd==1.2.0
 statsmodels==0.13.2
-onecodex[all,reports]==0.17.0
+onecodex[all,reports]==0.18.0
 taxonomy==0.10.0
 widgetsnbextension