Merge pull request #2359 from JinShil/impl_string_error

Error for implicit string concatenation
merged-on-behalf-of: Sebastian Wilzbach <sebi.wilzbach@gmail.com>

Author: dlang-bot

deprecate.dd

@@ -13,7 +13,7 @@ $(SPEC_S Deprecated Features,
         $(TROW $(DEPLINK Hexstring literals),                                     2.079, 2.079,  ,  )
         $(TROW $(DEPLINK Class allocators and deallocators),                       , 2.080,  ,  )
         $(TROW $(DEPLINK Implicit comparison of different enums),                 2.075,  2.075, 2.081,  )
-        $(TROW $(DEPLINK Implicit string concatenation),                          2.072,  2.072,  ,  )
+        $(TROW $(DEPLINK Implicit string concatenation),                          2.072,  2.072, 2.081,  )
         $(TROW $(DEPLINK Using the result of a comma expression),                 2.072,  2.072,  2.079,  )
         $(TROW $(DEPLINK delete),                                                  ,  2.079,  ,  )
         $(TROW $(DEPLINK scope as a type constraint),                             future,  ,  ,  )