Update of materials and tidy up files

.gitignore

@@ -16,3 +16,4 @@ materials/handout-R.pdf
 *.qpj
 materials/Thumbs.db
 materials/images/Thumbs.db
+*.pdf

README.md

@@ -2,11 +2,11 @@
 Material for 1 day Introductory Course on Introduction to Spatial Data & Using R as a GIS.
 
 The material for this workshop is avaliable here:  
-- [The PDF of the handout with the practical instructions (PDF, 2.29 MB)](https://github.com/nickbearman/intro-r-spatial-analysis/releases/download/7.0/intro-r-spatial-analysis.pdf)  
-- [The presentation given by Nick (PDF, 11 MB)](https://github.com/nickbearman/intro-r-spatial-analysis/releases/download/7.0/presentation.pdf)  
-- [The classification exercise (PDF, 93 KB)](https://github.com/nickbearman/intro-r-spatial-analysis/releases/download/7.0/classification-exercise-R.pdf)  
-- [The R Glossary and Helpsheet (PDF, 123 KB)](https://github.com/nickbearman/intro-r-spatial-analysis/releases/download/7.0/glossary-helpsheet.pdf)  
-- [The data used in the workshop (folder, total: 3.3 MB)](https://github.com/nickbearman/intro-r-spatial-analysis/tree/master/data)  
+- [The PDF of the handout with the practical instructions (PDF, 2.29 MB)](https://github.com/nickbearman/intro-r-spatial-analysis/releases/download/8.0/intro-r-spatial-analysis.pdf)  
+- [The presentation given by Nick (PDF, 11 MB)](https://github.com/nickbearman/intro-r-spatial-analysis/releases/download/8.0/presentation.pdf)  
+- [The classification exercise (PDF, 93 KB)](https://github.com/nickbearman/intro-r-spatial-analysis/releases/download/8.0/classification-exercise-R.pdf)  
+- [The R Glossary and Helpsheet (PDF, 122 KB)](https://github.com/nickbearman/intro-r-spatial-analysis/releases/download/8.0/glossary-helpsheet.pdf)  
+- [The data used in the workshop (folder, total: 8.1 MB)](https://github.com/nickbearman/intro-r-spatial-analysis/tree/master/data)  
 
 This practical was written using R 3.4.0 (2017-04-21) and RStudio 1.0.143 by Nick Bearman ([nick@clearmapping.co.uk](mailto:nick@clearmapping.co.uk)).