Drop "babel-preset-es2015" from dependencies as I added it in https://github.com/getgrav/grav-plugin-admin/commit/85922f93acedeb0c10f8f9ab5d460aad9baebdf5#diff-78c943774a8fd7759d2d63b5e9c5ba33, but not needed (already in devDependencies)
Drop "babel-preset-es2015" from dependencies as I added it in https://github.com/getgrav/grav-plugin-admin/commit/85922f93acedeb0c10f8f9ab5d460aad9baebdf5#diff-78c943774a8fd7759d2d63b5e9c5ba33, but not needed (already in devDependencies)

dimayakovlev/grav-plugin-admin,Sommerregen/grav-plugin-admin,getgrav/grav-plugin-admin,dimayakovlev/grav-plugin-admin,Sommerregen/grav-plugin-admin,Sommerregen/grav-plugin-admin,Sommerregen/grav-plugin-admin,dimayakovlev/grav-plugin-admin,getgrav/grav-plugin-admin,getgrav/grav-plugin-admin,dimayakovlev/grav-plugin-admin