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== 1.3.6
* support nil values. The Google Charts API specifies that a single underscore (_) can be used to omit a value from a line chart with 'simple' data encoding, and a double underscore (__) can do the same for a chart with 'extended' data encoding. (Matt Moyer)
* allow a label to appear on a google-o-meter via the :legend option. (hallettj)
== 1.3.5
* added code to properly escape image tag URLs (mokolabs)
* added themes support + 4 default themes (keynote, thirty7signals, pastel, greyscale) chart.line(:theme=>:keynote) (jakehow)
== 1.3.4
* updated documentation and cleaned it up (mokolabs)
* added support for custom class, id and alt tags when using the image_tag format (i.e Gchart.line(:data => [0, 26], :format => 'image_tag')) (mokolabs)
== 1.3.2 - 1.3.3
* changes required by github
== 1.3.1
* added width and spacing options
== 1.3.0
* added support for google-o-meter
* fixed a bug when the max value of a data set was 0
== 1.2.0
* added support for sparklines
== 1.1.0
* fixed another bug fix related to the uri escaping required to download the file properly.
== 1.0.0
* fixed the (URI::InvalidURIError) issue
== 0.2.0
* added export options (file and image tag)
* added support for all arguments to be passed as a string or an array
== 0.1.0 2007-12-11
* fixed the axis labels
== 0.0.3 2007-12-11
* added :chart_background alias and fixed a bug related to the background colors.
== 0.0.2 2007-12-11
* added support for more features and aliases
== 0.0.1 2007-12-08
* 1 major enhancement:
* Initial release
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