change task type to Universal for 'find_correlation'

Author: bblodfon

README.md

@@ -71,7 +71,7 @@ head(as.data.table(filter$calculate(task)))
 | cmim              | Minimal Conditional Mutual Information Maximization      | Classif & Regr | Integer, Numeric, Factor, Ordered                              | [praznik](https://cran.r-project.org/package=praznik)                                                            |
 | correlation       | Correlation                                              | Regr           | Integer, Numeric                                               | stats                                                                                                            |
 | disr              | Double Input Symmetrical Relevance                       | Classif & Regr | Integer, Numeric, Factor, Ordered                              | [praznik](https://cran.r-project.org/package=praznik)                                                            |
-| find_correlation  | Correlation-based Score                                  | Classif & Regr | Integer, Numeric                                               | stats                                                                                                            |
+| find_correlation  | Correlation-based Score                                  | Universal      | Integer, Numeric                                               | stats                                                                                                            |
 | importance        | Importance Score                                         | Universal      | Logical, Integer, Numeric, Character, Factor, Ordered, POSIXct |                                                                                                                  |
 | information_gain  | Information Gain                                         | Classif & Regr | Integer, Numeric, Factor, Ordered                              | [FSelectorRcpp](https://cran.r-project.org/package=FSelectorRcpp)                                                |
 | jmi               | Joint Mutual Information                                 | Classif & Regr | Integer, Numeric, Factor, Ordered                              | [praznik](https://cran.r-project.org/package=praznik)                                                            |