request->send(200, textPlainStr, jsonChartDataCharStr); - Without using String Class - to save heap

[khoih-prog]

This PR is from @salasidis

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As per the Readme.md file - I am getting 66k instead of 374k max heap space in my application. I should have no problem sending 2M files, or web pages larger than the main RAM

Since I create the web page once, and reuse, I make a second copy of the web page, so that when the send happens (which messes wit the actual string), I simply recopy C string C string for the next send - fast, easy, and almost no code changes required (none if you don't wish to use the features 0 fully backwards compatible I think)

request->send(200, "text/html", html_out, false);
strcpy(html_out, html_out_bak);

[khoih-prog]

LGTM. You've written very good code.

Can you make some minor changes to match with the current styles

1. Using AWS_LOGDEBUGx instead of Serial.printxx
2. Using tab = 2 spaces for correct indentation
3. Modify in README.md correctly by adding a note how to use the new feature / function

BTW, to create a PR, after you've forked the library and have done all the mods, just press Pull Requests (upper left corner, next to Code, and proceed. Just so simple for you.

[khoih-prog]

Replaced by the real PR #8