Update README: GNUPLOT's "sixel" driver is renamed as "sixeltek"
@@ -1345,7 +1345,7 @@ We are greatly inspired by the quality of ImageMagick and added some resampling
- [GNUPLOT](http://www.gnuplot.info/)
- Recent version of GNUPLOT supports new terminal driver "sixel" / "sixelgd".
+ Recent version of GNUPLOT supports new terminal driver "sixeltek(sixel)" / "sixelgd".
![GNUPLOT](https://raw.githubusercontent.com/saitoha/libsixel/data/data/gnuplot.png)
