Remove duplicate entry in CHANGELOG (#903)

Author: Joao-Dionisio

CHANGELOG.md

@@ -43,24 +43,6 @@
 - Made readStatistics a standalone function
 ### Removed
 
-## 5.1.1 - 2024-06-22
-### Added
-- Added SCIP_STATUS_DUALLIMIT and SCIP_STATUS_PRIMALLIMIT
-- Added SCIPprintExternalCodes (retrieves version of linked symmetry, lp solver, nl solver etc)
-- Added recipe with reformulation for detecting infeasible constraints
-- Wrapped SCIPcreateOrigSol and added tests 
-- Added verbose option for writeProblem and writeParams
-- Expanded locale test
-- Added methods for creating expression constraints without adding to problem
-- Added methods for creating/adding/appending disjunction constraints
-- Added check for pt_PT locale in test_model.py
-- Added SCIPgetOrigConss and SCIPgetNOrigConss Cython bindings. 
-- Added transformed=False option to getConss, getNConss, and getNVars
-### Fixed
-- Fixed locale errors in reading
-### Changed
-### Removed
-
 ## 5.0.1 - 2024-04-05
 ### Added
 - Added recipe for nonlinear objective functions