Log Message:
py-guppy3: update to version 3.0.7

Change log:

2019-09-21  YiFei Zhu  <zhuyifei1999@gmail.com>

    * Nothing changed, just releasing 3.0.7

2019-09-20  YiFei Zhu  <zhuyifei1999@gmail.com>

    * Simulate recursion with multiple node sets (MutNodeSet) and stacks
      (PyList) for generating a reference graph, so we don't get a C stack
      overflow
    * Make tab completion with rlcompleter on a UniSet not so expensive by
      using introspection and return if it's being called by rlcompleter

2019-09-19  YiFei Zhu  <zhuyifei1999@gmail.com>

    * Traverse all GC tracked items to find non-GC-tracked dicts in dictof
      classifier

2019-09-17  YiFei Zhu  <zhuyifei1999@gmail.com>

    * Optimize dictof classifier by using GC data rather than heap traversal
    * Scope all eval() in tests
    * Use a stack instead of recursion for heap traversals, except reference
      graph where a recursion limit is set

2019-09-16  YiFei Zhu  <zhuyifei1999@gmail.com>

    * Disabled malloc hooks because of thread safety issues
    * Fixed tests if installed as package