README.md: Corrected the build.bat filename.
README.md: Corrected the build.bat filename.

jeme/lucenenet,jeme/lucenenet,apache/lucenenet,jeme/lucenenet,apache/lucenenet,NightOwl888/lucenenet,apache/lucenenet,jeme/lucenenet,NightOwl888/lucenenet,apache/lucenenet,NightOwl888/lucenenet,NightOwl888/lucenenet