Update README.md

[divinepaul]

proposal to update the dataMap.
because it was confusing and and induced errors.

[apgapg]

What issue are you getting? I don't see any plus point in writing .toDouble() as my map is declared as <String,double>, hence it shouldn't create an issue

[divinepaul]

What issue are you getting? I don't see any plus point in writing .toDouble() as my map is declared as <String,double>, hence it shouldn't create an issue

......well the .toDouble was the soulution to error that I got while putting a int in to your map in the documentation.

[apgapg]

I guess the problem is in the dart version. I remember the new dart accepts 4 instead of 4.0 in padding etc, they said the integers are automatically casted. Could you please check your dart version?

[divinepaul]

I guess the problem is in the dart version. I remember the new dart accepts 4 instead of 4.0 in padding etc, they said the integers are automatically casted. Could you please check your dart version?

Flutter 1.5.4-hotfix.2 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 7a4c33425d (8 weeks ago) • 2019-04-29 11:05:24 -0700
Engine • revision 52c7a1e849
Tools • Dart 2.3.0 (build 2.3.0-dev.0.5 a1668566e5)

its Dart 2.3.0