fix notebooks fixes #114

[jvanhoefer]

Fixed two issues in the notebooks

• [x] (Incorrect) error message in the "main Lotka Volterra" notebook
• [x] data type in the FSP example would yield incorrect YAML-model, if one would write the model to YAML

[codecov-io]

Codecov Report

Merging #117 (48ff99b) into develop (3c45897) will increase coverage by 10.86%. The diff coverage is 90.78%.

@@             Coverage Diff              @@
##           develop     #117       +/-   ##
============================================
+ Coverage    77.85%   88.72%   +10.86%     
============================================
  Files            5        6        +1     
  Lines          429      461       +32     
============================================
+ Hits           334      409       +75     
+ Misses          95       52       -43     

Impacted Files	Coverage Δ
yaml2sbml/YamlModel.py	84.00% <77.77%> (-0.49%)	:arrow_down:
yaml2sbml/yaml_validation.py	89.65% <77.77%> (+17.65%)	:arrow_up:
yaml2sbml/yaml2sbml.py	89.86% <92.10%> (+14.48%)	:arrow_up:
yaml2sbml/__init__.py	100.00% <100.00%> (ø)
yaml2sbml/version.py	100.00% <100.00%> (ø)
yaml2sbml/yaml2PEtab.py	94.17% <100.00%> (+23.46%)	:arrow_up:

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