Changelog 0.4.0

Add all necessary functions to perform Correspondence Analysis (CA) (#9)
Replace standardize() and standardize_norm() by pca_standardize() and pca_standardize_norm()
Replace get_eig() and get_weighted_eigen() by pca_eigen() and pca_weighted_eigen()
Update all unit tests for better testing and coverage
Update _pkgdown.yml
facto_pca was updated to return same outputs as FactoMineR::PCA()
Contributing.md was updated by including testing coverage

alexym1 / FactoMineR2