import declarations may only appear at top level of a module

[carmenbranje]

I included d3-textwrap.js in my index file but I get the following error:

line 1 - import declarations may only appear at top level of a module

[woodz-]

Might be helpful to document a bit deeper and separate user groups:

• npm users: do this
• browser users: do that

For me it's not clear on how to use it in browser. Which file to include in <script> tags? Will I need to browserify first? Then which file to start over? etc.

Had a couple of error prone tries with browserify:

export {selection, select} from 'd3-selection';
^
ParseError: 'import' and 'export' may appear only with 'sourceType: module'

[vijithassar]

I've added this to the documentation.