Update changelog for v7.1.0 preview release

[cheenamalhotra]

• Updates changelog and version number
• Formats driver source code for release

[codecov-io]

Codecov Report

Merging #789 into dev will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##                dev     #789      +/-   ##
============================================
+ Coverage     48.24%   48.24%   +<.01%     
- Complexity     2786     2788       +2     
============================================
  Files           116      116              
  Lines         27862    27862              
  Branches       4641     4641              
============================================
+ Hits          13442    13443       +1     
- Misses        12197    12199       +2     
+ Partials       2223     2220       -3

Flag	Coverage Δ	Complexity Δ
#JDBC42	47.62% <100%> (-0.11%)	2733 <1> (-6)
#JDBC43	48.15% <100%> (+0.01%)	2786 <1> (+5)	⬆️

Impacted Files	Coverage Δ	Complexity Δ
...osoft/sqlserver/jdbc/SQLServerSpatialDatatype.java	85.38% <ø> (ø)	290 <0> (ø)	⬇️
...SQLServerColumnEncryptionJavaKeyStoreProvider.java	63.12% <ø> (ø)	10 <0> (ø)	⬇️
...a/com/microsoft/sqlserver/jdbc/SQLJdbcVersion.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	33.03% <100%> (+0.34%)	260 <0> (+4)	⬆️
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	60.9% <100%> (+0.64%)	88 <1> (+1)	⬆️
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	42.85% <0%> (-2.2%)	15% <0%> (-1%)
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java	38.14% <0%> (-0.65%)	42% <0%> (-1%)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	53.95% <0%> (-0.2%)	0% <0%> (ø)
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	52.6% <0%> (-0.12%)	261% <0%> (-2%)
... and 2 more

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[ulvii]

Javadoc.

[ulvii]

JUnit