Updated to support log4j 2.6.2 and jackson 2.8.3#33

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Commits on Oct 1, 2016

support log4j 2.6.2 and jackson 2.8.3, also remove deprecation warnings
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alternate method to work around immutable context map

majikthys
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Commits on Oct 2, 2016

update README
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Commits on Jul 30, 2017

updated to 2.8.2 of log4j2, may need more testing.
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