Update JDK to 'oraclejdk11' for Travis CI

[rene-ye]

Jdk 10 no longer supported by oracle.

[codecov-io]

Codecov Report

Merging #837 into dev will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev     #837      +/-   ##
============================================
- Coverage     48.31%   48.26%   -0.05%     
  Complexity     2782     2782              
============================================
  Files           116      116              
  Lines         27878    27877       -1     
  Branches       4651     4651              
============================================
- Hits          13468    13455      -13     
- Misses        12190    12212      +22     
+ Partials       2220     2210      -10

Flag	Coverage Δ	Complexity Δ
#JDBC42	47.77% <ø> (-0.04%)	2742 <ø> (+1)
#JDBC43	48.22% <ø> (-0.02%)	2779 <ø> (+1)

Impacted Files	Coverage Δ	Complexity Δ
...m/microsoft/sqlserver/jdbc/SQLServerException.java	75.93% <0%> (-1.51%)	30% <0%> (-1%)
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	43.1% <0%> (-1.32%)	105% <0%> (-1%)
...n/java/com/microsoft/sqlserver/jdbc/Parameter.java	62.92% <0%> (-0.81%)	64% <0%> (ø)
...oft/sqlserver/jdbc/SQLServerPreparedStatement.java	51.58% <0%> (-0.2%)	212% <0%> (ø)
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	62.11% <0%> (-0.12%)	0% <0%> (ø)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	32.69% <0%> (-0.08%)	255% <0%> (-1%)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	54.45% <0%> (-0.04%)	0% <0%> (ø)
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	52.58% <0%> (ø)	263% <0%> (ø)	⬇️
...oft/sqlserver/jdbc/SQLServerParameterMetaData.java	24.62% <0%> (+0.05%)	31% <0%> (ø)	⬇️
...n/java/com/microsoft/sqlserver/jdbc/DataTypes.java	79.48% <0%> (+0.19%)	5% <0%> (+1%)	⬆️
... and 3 more

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