fix readme

README.md

@@ -22,14 +22,14 @@ Please see [NELL paper](https://www.cs.cmu.edu/~tom/pubs/NELL_aaai15.pdf) to kno
 
 - Number of instances
 
- |                                 |   train |   validation |   test |                                                                                        
+|                                 |   train |   validation |   test |                                                                                        
 |:--------------------------------|--------:|-------------:|-------:|                                                                                         
 | number of pairs                 |    5498 |          878 |   1352 |                                                                                         
 | number of unique relation types |      32 |            4 |      6 |   
 
 - Number of pairs in each relation type
 
- |                                                    |   number of pairs (train) |   number of pairs (validation) |   number of pairs (test) |
+|                                                    |   number of pairs (train) |   number of pairs (validation) |   number of pairs (test) |
 |:---------------------------------------------------|--------------------------:|-------------------------------:|-------------------------:|
 | concept:airportincity                              |                       210 |                              0 |                        0 |
 | concept:athleteledsportsteam                       |                       424 |                              0 |                        0 |