Update README.md

README.md

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 # ParallelGDDetect
 A package to detect distinct genome doubling events which have occurred in different samples from the same tumour.
 
-Function is provided which takes as input the number of genome doublings (GDs) for each region as estimated from the genome
+A function is provided which takes as input the number of genome doublings (GDs) for each region as estimated from the genome
 wide copy number and mutation copy numbers in each region and devolves which GDs across samples are part of
 the same event and which present distinct events as indicated by the doubling of subclonal mutations which
 will occur when the subclonal mutation arises before a given subclonal GD event. We recommend plotting the mutation