Update Tedious dependency to 2.7.1

[willmorgan]

This just bumps us to a BC update containing bugfixes: tediousjs/tedious#769.

In theory this library could be upgraded to also drop Node v4 and support Tedious 3.0.

Closes #711
Fixes #470

[willmorgan]

@patriksimek it seems AppVeyor tests randomly failed, but this is an otherwise good change to get in. Can you take a look, please?

cc: @ben-page / @bretcope / @Suraiya-Hameed

[willmorgan]

@kibertoad, @patriksimek, @ben-page, @bretcope, @Suraiya-Hameed, anyone? This is a hilariously easy upgrade and fixes issues we're facing.

This library is unusable long term unless it's actually maintained.

[dhensby]

Apparently this is also another fix for pool depletion as tedious have fixed an upstream issue where connections that never established don't get rejected as errors.

[dhensby]

see tediousjs/tedious#769

[kibertoad]

@willmorgan I wish I could help, but unfortunately I don't have approval permissions on this project. Can you try closing and reopening the issue to rerun tests on appveyor?
@patriksimek Would you consider merging this?

[kibertoad]

Also we really need more maintainers on this project...

[patriksimek]

Thank you and sorry for the delay.

[willmorgan]

@patriksimek Thanks. @dhensby and I could perhaps take on maintainer duties to keep merging down Tedious, if that's any help?

@kibertoad Closing/reopening is a good idea for next time, thanks.

[dhensby]

@patriksimek thanks for releasing 4.2.2; are you using npm version to create the versions? If so, can you make sure you push the tags to the repo too?

git push origin master --follow-tags when you create a release? If you could go and run that command locally it should push up the missing tags from the GH repo (though I've manually created a 4.2.2 tag so that may conflict)

[patriksimek]

@dhensby I haven't used tags at all. I was doing all the publishing manually. I know... :( I was hoping to automate that soon. If you can give me your npm username, I'll give you the publish permissions.

@willmorgan That would be pretty awesome :)

[dhensby]

@patriksimek dhensby

[patriksimek]

@dhensby Done!

[dhensby]

I haven't used tags at all. I was doing all the publishing manually.

@patriksimek So you aren't using npm version to create the releases / bump the version numbers?