Update readme.md

Author: plumonito

readme.md

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 The DTSLAM API provides a framework and code for the approach introduced in "DT-SLAM: Deferred Triangulation for Robust SLAM" published in IEEE 3DV 2015. If you use this work for any of your publications please cite:
 
-Herrera C., D., Kim, K., Kannala, J., Pulli, K., Heikkila, J., *DT-SLAM: Deferred Triangulation for Robust SLAM*, 3DV, 2015.
+Herrera C., D., Kim, K., Kannala, J., Pulli, K., Heikkila, J., *DT-SLAM: Deferred Triangulation for Robust SLAM*, 3DV, 2014.
 
 Active members and contributors (as of Nov. 2014)
 - Daniel Herrera C. ([email protected])