Change main to upstream and fix one line
Updated Array1DTracer (markdown)
Updated WeightedUndirectedGraphTracer (markdown)
Updated WeightedDirectedGraphTracer (markdown)
Updated UndirectedGraphTracer (markdown)
Updated DirectedGraphTracer (markdown)
Updated ChartTracer (markdown)
Updated Array2DTracer (markdown)
Updated Project Details (markdown)
Updated Contributing (markdown)
Updated Home (markdown)