param.Action is broken

[ceball]

See #7

[kcpevey]

This appears to still be broken. I am trying to create a param.Action button that just prints a statement. This example works works in paramnb and seems like it should also work in parambokeh. Am I missing something?

def hello(x):
    print("Hello %s" % x)

class BaseClass(param.Parameterized):
    x                       = param.Parameter(default=3.14,doc="X position")

class Example(BaseClass):
    msg                     = param.Action(hello, doc="""Print a message.""",precedence=0.7)
    
parambokeh.Widgets(Example)