Remove FS warnings from README #251

Job	Run time
build	13m 59s
test (BoxingTests.Kernel)	5m 8s
test (Cosmos.Compiler.Tests.TypeSystem.Kernel)	6m 55s
test (Cosmos.Compiler.Tests.Bcl.Kernel)	6m 53s
test (Cosmos.Compiler.Tests.Bcl.System.Kernel)	7m 39s
test (Cosmos.Compiler.Tests.Exceptions.Kernel)	5m 31s
test (Cosmos.Compiler.Tests.MethodTests.Kernel)	5m 20s
test (Cosmos.Compiler.Tests.SingleEchoTest.Kernel)	5m 43s
test (Cosmos.Kernel.Tests.Fat.Kernel)	5m 36s
test (Cosmos.Kernel.Tests.IO.Kernel)	4m 12s
test (SimpleStructsAndArraysTest.Kernel)	3m 11s
test (Cosmos.Kernel.Tests.DiskManager.Kernel)	4m 23s
test (GraphicTest.Kernel)	6m 51s
test (NetworkTest.Kernel)	4m 37s
test (AudioTests.Kernel)	8m 3s
test (MemoryOperationsTest.Kernel)	5m 58s
test (ProcessorTests.Kernel)	3m 2s
	1h 43m 1s

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