Forbid sympy 1.10.* due to upstream issue with autowrap

[clinssen]

Temporary fix for #58.

[codecov-commenter]

Codecov Report

Merging #59 (2a4985f) into master (bb71b0a) will decrease coverage by 19.20%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #59       +/-   ##
===========================================
- Coverage   82.60%   63.39%   -19.21%     
===========================================
  Files          25       25               
  Lines        1937     1937               
===========================================
- Hits         1600     1228      -372     
- Misses        337      709      +372     

Impacted Files	Coverage Δ
odetoolbox/stiffness.py	0.00% <0.00%> (-85.90%)	⬇️
odetoolbox/mixed_integrator.py	11.29% <0.00%> (-62.91%)	⬇️
tests/test_stiffness.py	37.83% <0.00%> (-56.76%)	⬇️
tests/test_expression_simplification.py	45.00% <0.00%> (-55.00%)	⬇️
tests/test_mixed_integrator_numeric.py	30.30% <0.00%> (-42.43%)	⬇️
odetoolbox/spike_generator.py	57.44% <0.00%> (-40.43%)	⬇️
odetoolbox/sympy_printer.py	61.90% <0.00%> (-23.81%)	⬇️
odetoolbox/__init__.py	67.59% <0.00%> (-20.84%)	⬇️
tests/test_analysis_mixed_analytic_numerical.py	79.31% <0.00%> (-17.25%)	⬇️
odetoolbox/system_of_shapes.py	85.42% <0.00%> (-4.53%)	⬇️
... and 4 more

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[pnbabu]

Thanks!