Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-02-15 21:04 65fe78ae

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feat(analysis/special_functions/trigonometric): add missing continuity attributes (#6236) I added continuity attributes to lemmas about the continuity of trigonometric functions, e.g. continuous_sin, continuous_cos, continuous_tan, etc. This came up in this Zulip conversation I also added real.continuous_tan.

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