fixed a bug: wrong symbol in operams installation cmd (issue #43)

workflow/rules/setup.smk

@@ -41,7 +41,7 @@ rule install_operams:
     message:
         "Setup: install OPERA-MS"
     shell:
-        "(cd ${params.path} && make && perl utils/install_perl_module.pl && perl OPERA-MS.pl check-dependency) &> {log} && touch {output}"
+        "(cd {params.path} && make && perl utils/install_perl_module.pl && perl OPERA-MS.pl check-dependency) &> {log} && touch {output}"
 
 # Download RGI data
 rule download_rgi_db: