docs: fix year in license
docs: fix year in license

ig-sinicyn/BenchmarkDotNet,Ky7m/BenchmarkDotNet,alinasmirnova/BenchmarkDotNet,adamsitnik/BenchmarkDotNet,adamsitnik/BenchmarkDotNet,adamsitnik/BenchmarkDotNet,Ky7m/BenchmarkDotNet,ig-sinicyn/BenchmarkDotNet,adamsitnik/BenchmarkDotNet,alinasmirnova/BenchmarkDotNet,ig-sinicyn/BenchmarkDotNet,Ky7m/BenchmarkDotNet,alinasmirnova/BenchmarkDotNet,PerfDotNet/BenchmarkDotNet,alinasmirnova/BenchmarkDotNet,PerfDotNet/BenchmarkDotNet,PerfDotNet/BenchmarkDotNet,Ky7m/BenchmarkDotNet,ig-sinicyn/BenchmarkDotNet