Create Changelog.md

Author: mikemartinez99

Changelog.md

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+**v1.3 Changes**
+
+- PCA is calculated using a dynamic number of HVGs (specified by asymptote detection) as well as using ALL genes
+- Switched plotting over to plotnine (updated pcaplot_env.yaml)
+- Added fast clustering (update pcaplot_env.yaml)
+- Added log file output that informs how many HVGs were used for PCA calculation
+- Updates to multiqc_env.yaml to help github tests pass