So what happened to SoftSerial?
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listed in the libraries
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figure this out?
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a bug
If something is listed in the "libraries" directory of the distribution and not the "core" section, you have to include the header for that library. (As is noted in user comments on the site where you got your code.) This has not changed. Ya still gotta include the library header. It's still not a "bug."
So: In the IDE, with the sketch opened, click the Sketch->Import Library menu item and select SoftwareSerial (See Footnote.)
The proper #include statement will be inserted at the beginning of your sketch.
Regards,
Dave
Footnote:
The reason that I like to use the Import Library thingie from the Sketch menu rather than typing the #include statement myself is that you can see exactly what the compiler will see when it compiles your program. The library you are talking about is "SoftwareSerial," not "SoftSerial."