Test Improvements + Readme changes

[cheenamalhotra]

• Reduces execution time of junit tests by 2 mins
• Cleans tests to close all connections
• Updates to Readme file

[codecov-io]

Codecov Report

Merging #919 into dev will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev     #919      +/-   ##
============================================
+ Coverage     50.46%   50.47%   +0.01%     
  Complexity     2935     2935              
============================================
  Files           120      120              
  Lines         28112    28112              
  Branches       4695     4695              
============================================
+ Hits          14186    14189       +3     
+ Misses        11634    11633       -1     
+ Partials       2292     2290       -2

Flag	Coverage Δ	Complexity Δ
#JDBC42	50.04% <ø> (-0.01%)	2897 <ø> (ø)
#JDBC43	50.36% <ø> (-0.01%)	2930 <ø> (-1)

Impacted Files	Coverage Δ	Complexity Δ
...om/microsoft/sqlserver/jdbc/SimpleInputStream.java	52.94% <0%> (-1.48%)	11% <0%> (-1%)
...c/main/java/com/microsoft/sqlserver/jdbc/Util.java	61.77% <0%> (-0.44%)	89% <0%> (-1%)
...n/java/com/microsoft/sqlserver/jdbc/DataTypes.java	79.68% <0%> (-0.2%)	5% <0%> (-1%)
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	51.55% <0%> (-0.13%)	256% <0%> (-1%)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	55.59% <0%> (-0.1%)	0% <0%> (ø)
...rc/main/java/com/microsoft/sqlserver/jdbc/dtv.java	68.59% <0%> (+0.05%)	0% <0%> (ø)	⬇️
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	43.58% <0%> (+0.19%)	315% <0%> (+2%)	⬆️
...ncurrentlinkedhashmap/ConcurrentLinkedHashMap.java	39% <0%> (+0.21%)	43% <0%> (ø)	⬇️
...soft/sqlserver/jdbc/SQLServerPooledConnection.java	70.52% <0%> (+1.05%)	19% <0%> (+1%)	⬆️
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	47.28% <0%> (+1.08%)	112% <0%> (+1%)	⬆️

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