fix formatting in readme

README.md

@@ -22,18 +22,18 @@ git clone https://git.flavigny.de/christian/hateimparlament
 cd hateimparlament
 ```
 Then open a `R` shell and do
-```
+```r
 devtools::load_all() # load package
 devtools::wd() # set working directory
 ```
 Then fetch all records, read them and write the parsed tibbles to csv files.
-```
+```r
 fetch_all(create = TRUE)
 read_all() %>% repair() -> res
 write_to_csv(create = TRUE)
 ```
 Now you can build the vignettes faster by using
-```
+```r
 devtools::install(build_vignettes = T)
 ```
 This creates a `doc/` directory with all built vignettes.