Remove `import PropTypes from 'prop-types'`

[vincentbel]

Using PropTypes in any other way than annotating React components with them is no longer supported. So I think it's safe to remove the import declaration.

I'll open an PR if you agree this. @mohsen1

[mohsen1]

Yes I agree. There is also import React, {PropTypes} from 'react' import statement that we need to remove PropTypes from named import clause