Minor typos in README

[iagrigorov]

Thanks for your excellent work and building of community! This is not that important, but I have found a few typos in README.md:

• line 23: "Each synthesis flow has a predefined length L (L=20, in our case). We preserved all AIGs: starting, intermediate and final AIGs with labels like number of nodes, longest path, sequence of atomic synthesis transformations (rewrite, refactor, balance etc.) along with graph statistics, area and delay of final AIG." (original is transofrmations);
• line 38: "We list down the packages which we used on our side for experimentation. We recommend installing the packages using requirements.txt file provided in our repository." (original is experimentations);
• line 81: 5. "In statistics directory, we have two subfolders: adp and finalAig. In adp, we have csv files for all designs with information about area and delay of final AIG post tech-mapping. In finalAig, csv files have information about graph characteristics of final AIGs obtained post optimization. Also, there is another file named synthesisStastistics.pickle which have all the above information in dictionary format. This file is used for labeling purpose in ML pipeline for various tasks." (originals are diretcory, synthesisstastistics.pickle and labelling);
• line 146: "models directory contains the benchmarked model described in details in our paper. The names of the python utilities are self-explanatory." (original is self explainatory);
• line 177: "Setting lp=1 and dataset=set1 will pick appropriate train-test split strategy dataset for QoR regression problem. The model will run for 60 epochs and report the training, validation and test performance on the dataset outputting appropriate plots." (original is outputing).

Hope it will be helpful.