Release notes for version 0.2.0

Updated README.md with information about the project

bugfix: removed unused dependencies from Pipfile -> now the installation process should be free of errors
bugfix: Transposed results file so that it can be fully imported with Excel
bugfix: Fixed issue with the update_params.txt (needed to be removed)
bugfix: removed floating point numbers of years in results file names
bugfix: fixed error message when no data to plot


Plot tool new functionalities:
	- Added button to clear data from plots
	- Added search bar for model variables
	- Names of the scenarios in the legends of plots (taken from filename, when data loaded from file)
	- Resizable interior window frames
	- Added line markers to facilitate visualisation
	- Cleared graph if there's no data to plot
	- Improved information in standard output
	- Remonved Save option from the File menu
	- When saving a plot, the default image name is the name of the plotted variable
	- When saving a plot, the default folder is the folder where the model results are stored


Allowing advanced users to change any model parameter (see utils.ipynb for instructions)

Removed possibility to change initial date (it's not possible either in Vensim)

NOTES: 
-Trying to load results files generated with the previous version of the model will not work (time is now in the first row in the csv)
-If the user changes the name of the results file, at the time of loading it with the plot_tool.py, the legend might show "unknown" scenario.