fix ShellCommandReceive ImportError

File "/.../ipyparallel/shellcmd.py", line 19, in <module>
    from .cluster.shellcmd import ShellCommandReceive
ImportError: cannot import name 'ShellCommandReceive' from 'ipyparallel.cluster.shellcmd'

Author: peeweep

ipyparallel/shellcmd.py

@@ -16,7 +16,7 @@
 import sys
 from argparse import ArgumentParser
 
-from .cluster.shellcmd import ShellCommandReceive
+from .cluster.shellcmd_receive import ShellCommandReceive
 
 
 def main():