catching -t use and printing warning

pangolin/__init__.py

@@ -1,2 +1,2 @@
 _program = "pangolin"
-__version__ = "2.2.1"
+__version__ = "2.2.2"

pangolin/command.py

@@ -47,6 +47,7 @@ def main(sysargs = sys.argv[1:]):
     parser.add_argument('--min-length', action="store", default=10000, type=int,help="Minimum query length allowed for pangolin to attempt assignment. Default: 10000",dest="minlen")
     parser.add_argument('--panGUIlin', action='store_true',help="Run web-app version of pangolin",dest="panGUIlin")
     parser.add_argument("--verbose",action="store_true",help="Print lots of stuff to screen")
+    parser.add_argument("-t","--threads",action="store",help="Number of threads")
     parser.add_argument("-v","--version", action='version', version=f"pangolin {__version__}")
     parser.add_argument("-pv","--pangoLEARN-version", action='version', version=f"pangoLEARN {pangoLEARN.__version__}",help="show pangoLEARN's version number and exit")
     parser.add_argument("--update", action='store_true', default=False, help="Automatically updates to latest release of pangolin and pangoLEARN, then exits")
@@ -117,7 +118,8 @@ def main(sysargs = sys.argv[1:]):
         print(pfunk.green(f"--no-temp:") + "all intermediate files will be written to {outdir}")
         tempdir = outdir
 
-
+    if args.threads:
+        print(pfunk.cyan(f"\n--threads flag used, but threading not currently supported. Continuing with one thread."))
 
     """
     QC steps:

setup.py

@@ -21,7 +21,6 @@
       package_data={"pangolin":["data/*"]},
       install_requires=[
             "biopython>=1.70",
-            "pytools==2020.1",
             'pandas>=1.0.1',
             "wheel>=0.34",
             'joblib>=0.11',