travis: correctly constrain version
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@ -24,7 +24,7 @@ before_install:
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- conda activate pypsa-eur
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# install open-source solver
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- mamba install -c conda-forge glpk ipopt<3.13.3
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- mamba install -c conda-forge glpk ipopt'<3.13.3'
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# list packages for easier debugging
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- conda list
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