Merge branch 'recover' of https://github.com/DhananjayAshok/PySR into recover

pysr/sr.py

@@ -251,7 +251,8 @@ def pysr(X=None, y=None, weights=None,
                  weightMutateOperator=weightMutateOperator,
                  weightRandomize=weightRandomize,
                  weightSimplify=weightSimplify,
-                 constraints=constraints)
+                 constraints=constraints,
+                 extra_sympy_mappings=extra_sympy_mappings)
 
     kwargs = {**_set_paths(tempdir), **kwargs}
 
@@ -301,7 +302,7 @@ def _final_pysr_process(julia_optimization, procs, runfile_filename, timeout, **
     if timeout is not None:
         command = [f'timeout', f'{timeout}'] + command
     print("Running on", ' '.join(command))
-    process = subprocess.Popen(command, stdout=subprocess.PIPE, bufsize=1, shell=True)
+    process = subprocess.Popen(command, stdout=subprocess.PIPE, bufsize=1)
     try:
         while True:
             line = process.stdout.readline()