Update NEWS.md

Author: remlapmot

NEWS.md

@@ -1,6 +1,12 @@
 # TwoSampleMR v0.6.28
 
-(Release date 2025-12-15)
+(Release date 2025-12-16)
+
+* Skip two tests if the **MendelianRandomization** package is not installed and protected the running of the perform_mr vignette.
+
+# TwoSampleMR v0.6.28
+
+(Release date 2025-12-16)
 
 * Allowed the arguments for `clump_data()` to be specified from `read_exposure_data()` (thanks @al3xjwood).
 * Fixed two function calls in `mr_moe_single()`