Fixed .NET 4 project.
Fixed .NET 4 project.

skomis-mm/serilog,khellang/serilog,joelweiss/serilog,redwards510/serilog,JuanjoFuchs/serilog,richardlawley/serilog,adamchester/serilog,CaioProiete/serilog,richiej84/serilog,adamchester/serilog,ajayanandgit/serilog,vorou/serilog,vossad01/serilog,serilog/serilog,serilog/serilog,clarkis117/serilog,nblumhardt/serilog,clarkis117/serilog,SaltyDH/serilog,jotautomation/serilog,colin-young/serilog,nblumhardt/serilog,merbla/serilog,Jaben/serilog,ravensorb/serilog,ravensorb/serilog,merbla/serilog,harishjan/serilog,Applicita/serilog,DavidSSL/serilog,joelweiss/serilog,skomis-mm/serilog,zmaruo/serilog,harishjan/serilog,colin-young/serilog