Update version.txt to 1.0

[GregoryComer]

Summary

Update version.txt to 1.0.0 in preparation for the release branch cut.

[pytorch-bot]

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[mergennachin]

oh yeah, should've been 1.0.0 after 0.7.0 to begin with.

[abhinaykukkadapu]

@mergennachin do we need a0 at the end for 1.0 release as it is not treated as alpha release?