[ZEPPELIN-5002] Update JDK version in documentation

### What is this PR for?
Java 8 is required to building from source.

In 'install' page, it is 1.8 (151+)
http://zeppelin.apache.org/docs/0.9.0-preview2/quickstart/install.html

but in 'build' page, it's 1.7
http://zeppelin.apache.org/docs/0.9.0-preview2/setup/basics/how_to_build.html#how-to-build-zeppelin-from-source

### What type of PR is it?
Bug Fix

### Todos
* [ ] - Task

### What is the Jira issue?
https://issues.apache.org/jira/browse/ZEPPELIN-5002

### How should this be tested?
* First time? Setup Travis CI as described on https://zeppelin.apache.org/contribution/contributions.html#continuous-integration
* Strongly recommended: add automated unit tests for any new or changed behavior
* Outline any manual steps to test the PR here.

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update?
* Is there breaking changes for older versions?
* Does this needs documentation?

Author: Philipp Dallig <philipp.dallig@gmail.com>
Author: Yurim Jin <jayjinjay@gmail.com>

Closes #3880 from milooy/feat/ZEPPELIN-5002 and squashes the following commits:

2c423ab8a [Philipp Dallig] Update how_to_build.md
94ec52849 [Yurim Jin] [ZEPPELIN-5002] Update JDK version in documentation
1 file changed
tree: 8241aa8c07265cc20dacf467310ac1af375b8de5
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  64. .appveyor.yml
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  69. LICENSE
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  72. README.md
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  74. SECURITY-README.md
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  76. travis_check.py
README.md

Apache Zeppelin

Documentation: User Guide
Mailing Lists: User and Dev mailing list
Continuous Integration: Build Status
Contributing: Contribution Guide
Issue Tracker: Jira
License: Apache 2.0

Zeppelin, a web-based notebook that enables interactive data analytics. You can make beautiful data-driven, interactive and collaborative documents with SQL, Scala and more.

Core feature:

  • Web based notebook style editor.
  • Built-in Apache Spark support

To know more about Zeppelin, visit our web site https://zeppelin.apache.org

Getting Started

Install binary package

Please go to install to install Apache Zeppelin from binary package.

Build from source

Please check Build from source to build Zeppelin from source.