ensure omamer 2.1.1 is not used

omamer search has a bug in 2.1.1: DessimozLab/omamer#57

Author: alpae

pyproject.toml

@@ -18,7 +18,7 @@ dependencies = [
     "DendroPy >=4.5,<=4.6.1",
     "ete3 ~=3.1",
     "lxml >=4.6,<6",
-    "omamer ~=2.0",
+    "omamer >=2.1,<3,!=2.1.1",
     "pyham ~=1.1",
     "numpy",
     "pyparsing",