Description of problem:
Antimony does not compile against python37.

Version-Release number of selected component (if applicable):
antimony-0.9.3

Actual results:
[  9%] Building CXX object lib/graph/CMakeFiles/SbGraph.dir/src/types/downstream.cpp.o
cd /builddir/build/BUILD/antimony-0.9.3/build/lib/graph && /usr/bin/c++   -isystem /usr/include/python3.7m -I/builddir/build/BUILD/antimony-0.9.3/lib/graph/inc  -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fPIC -pie -DNDEBUG -DRELEASE   -std=gnu++11 -o CMakeFiles/SbGraph.dir/src/types/downstream.cpp.o -c /builddir/build/BUILD/antimony-0.9.3/lib/graph/src/types/downstream.cpp
/builddir/build/BUILD/antimony-0.9.3/lib/graph/src/util.cpp: In function 'std::pair<std::__cxx11::basic_string<char>, int> getPyError()':
/builddir/build/BUILD/antimony-0.9.3/lib/graph/src/util.cpp:50:35: error: invalid conversion from 'const char*' to 'char*' [-fpermissive]
         char* c = PyUnicode_AsUTF8(PyList_GetItem(lst, i));
                   ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [lib/graph/CMakeFiles/SbGraph.dir/build.make:157: lib/graph/CMakeFiles/SbGraph.dir/src/util.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....


Additional info:

Bug reported to upstream: https://github.com/mkeeter/antimony/issues/193