[hotfix] Update README.md building prerequisites

This closes #5924


Project: http://git-wip-us.apache.org/repos/asf/flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/flink/commit/58e53b0b
Tree: http://git-wip-us.apache.org/repos/asf/flink/tree/58e53b0b
Diff: http://git-wip-us.apache.org/repos/asf/flink/diff/58e53b0b

Branch: refs/heads/release-1.5
Commit: 58e53b0b9bc0f9583be3d77436a99739fe23cf32
Parents: f1d536a
Author: 陈梓立 <[email protected]>
Authored: Fri Apr 27 09:07:33 2018 +0800
Committer: Stephan Ewen <[email protected]>
Committed: Mon Apr 30 23:24:54 2018 +0200

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 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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http://git-wip-us.apache.org/repos/asf/flink/blob/58e53b0b/README.md
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diff --git a/README.md b/README.md
index 095f652a..7966ecd 100644
--- a/README.md
+++ b/README.md
@@ -67,10 +67,10 @@ counts.writeAsCsv(outputPath)
 
 Prerequisites for building Flink:
 
-* Unix-like environment (We use Linux, Mac OS X, Cygwin)
+* Unix-like environment (we use Linux, Mac OS X, Cygwin)
 * git
 * Maven (we recommend version 3.2.5)
-* Java 8
+* Java 8 (Java 9 and 10 are not yet supported)
 
 ```
 git clone https://github.com/apache/flink.git

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