Caching mvn dependencies for Appveyor

[ahmad-ibra]

This is done to speed up builds

[codecov-io]

Codecov Report

Merging #320 into RTW_6.2.0 will decrease coverage by 0.06%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             RTW_6.2.0    #320      +/-   ##
==============================================
- Coverage        37.17%   37.1%   -0.07%     
+ Complexity        1670    1666       -4     
==============================================
  Files              103     103              
  Lines            23663   23663              
  Branches          3918    3918              
==============================================
- Hits              8796    8781      -15     
- Misses           13278   13296      +18     
+ Partials          1589    1586       -3

Flag	Coverage Δ	Complexity Δ
#JDBC41	36.99% <ø> (-0.05%)	1658 <ø> (-6)
#JDBC42	37.01% <ø> (-0.03%)	1662 <ø> (+2)

Impacted Files	Coverage Δ	Complexity Δ
...om/microsoft/sqlserver/jdbc/ReaderInputStream.java	41.57% <0%> (-4.5%)	14% <0%> (-3%)
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	29.43% <0%> (-0.68%)	56% <0%> (ø)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	26.86% <0%> (-0.38%)	184% <0%> (-3%)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	45.78% <0%> (-0.11%)	0% <0%> (ø)
.../microsoft/sqlserver/jdbc/SQLServerConnection.java	43.23% <0%> (+0.08%)	254% <0%> (+2%)	⬆️
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	48.93% <0%> (+0.14%)	210% <0%> (ø)	⬇️

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[v-nisidh]

Check with new cache settings. Run couple of times if you able to see improvement then use new settings.

[v-nisidh]

I think it should be directory caching. By following snippet it will cache whole directory.

cache:
  directories:
    - $HOME/.m2

or

cache:
 - $HOME/.m2

[ahmad-ibra]

changing to $HOME didnt work.

With that update, appveryor can't find the cache, downloads all maven dependencies, and then creates a new build cache on every build.

Reverting back to original implementation