Fix bugs due to changes in Julia AST, sympy, etc.

Fix bugs due to changes in Julia AST and sympy

Several changes in the Julia AST, sympy, and elsewhere have broken Symata.
This PR allows sympy to compile/load and some of the tests to pass.

v0.4.8

Symata v0.4.8

Diff since v0.4.7

Merged pull requests:

• Install TagBot as a GitHub Action (#179) (@JuliaTagBot)

v0.4.7

v0.4.7 (2020-01-26)

Diff since v0.4.5

Closed issues:

• getindex\(o::PyObject, s::Symbol\) is deprecated in favor of dot overloading (#173)
• Symata repl broken on Julia v1.2 (#172)
• use ReplMaker (#171)
• pycall api updates (#167)
• BuiltIns() is broken (#166)
• Generated symbols should be easier to work with (#164)
• using Symata fails for Julia 1.0.0 on Windows (#155)
• Any idea on this PyCall.PyObject issue? (#129)

Compatibility with Julia v1.0

v0.4.5

version 4.4.5

fix bugs and warnings

Fixed several bugs, including old bugs.
Reduced the number of deprecation warnings.

upgrade all tests and example notebooks for Julia v0.7

v0.4.1

upgrade all example notebooks for Julia v0.7

release for Julia v0.7-beta

This version supports v0.7-beta and drops support for all earlier versions. Some functionality remains to be upgraded. This release has been tested at the REPL, but not in Jupyter.

add dependency on QuadGK.jl

v0.3.0

add dependency on QuadGK.jl