Decide which ruby versions to support

[isuruf]

In travis, we test,

• 1.9.3
• 2.0
• 2.1
• 2.2
• 2.3.0

We initially included these because these were the ones supported in NMatrix I think.

Since official support for 1.9.3 is stopped including security patches, I'm okay with dropping 1.9.3. What do you think?

@zverok, @certik, @abinashmeher999, @rajithv, @MohawkJohn, @v0dro

[zverok]

I'd boldly say that 2.0 should go away too.
It is already deprecated, and 2.1 have significantly superior features (keyword arguments and refinements), and as SymEngine is more than any other SciRuby project needs clean modern API, ...

[v0dro]

I'd still say go with ruby 2+ for now and then drop support by the end of the year.

[abinashmeher999]

Since 1.9.3 is the only one that is making us take extra effort to write
compatible code, that should be the one to go first. One of the tests for
1.9.3 fails on OS X too.

For 2.0 we haven't had any problems yet, I think. Let us keep the tests for
2.0 for now and when we come across another issue where something is not
supported in 2.0 we can drop it then.

On Wed, Jun 1, 2016, 1:25 PM Sameer Deshmukh notifications@github.com
wrote:

I'd still say go with ruby 2+ for now and then drop support by the end of
the year.

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[certik]

Let's drop 1.9.3. since it doesn't receive security patches. We can
probably drop 2.0 as well, but we can also be conservative and drop it a
bit later.

Sent from my mobile phone.
On Jun 1, 2016 9:32 AM, "Isuru Fernando" notifications@github.com wrote:

In travis, we test,

• 1.9.3
• 2.0
• 2.1
• 2.2
• 2.3.0 We initially included these because these were the ones
  supported in NMatrix I think.

Since official support for 1.9.3 is stopped including security patches,
I'm okay with dropping 1.9.3. What do you think?

@zverok https://github.com/zverok, @certik https://github.com/certik,
@abinashmeher999 https://github.com/abinashmeher999, @rajithv
https://github.com/rajithv, @MohawkJohn https://github.com/mohawkjohn,
@v0dro https://github.com/v0dro

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[isuruf]

Seems 2.0 also doesn't receive security patches. We should drop 2.0 as well.