Drop support for Go < 1.15 (#1028)

Per our CI, we don't support versions of Go older than 1.15. The files global_go112 and global_prego112 existed to support different stack depths for the standard library logger, which changed going from Go 1.11 to 1.12 (ref #682). This is no longer necessary; Go 1.11 is old enough that we don't need to support it.
uber-go · Nov 9, 2021 · aea2a50 · aea2a50
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -11,8 +11,12 @@ Enhancements:
 Bugfixes:
 * [#1011][]: JSON: Fix inaccurate precision when encoding complex64.
 
+Other changes:
+* [#1028][]: Drop support for Go < 1.15.
+
 [#1011]: https://github.com/uber-go/zap/pull/1011
 [#989]: https://github.com/uber-go/zap/pull/989
+[#1028]: https://github.com/uber-go/zap/pull/1028
 
 ## 1.19.1 (8 Sep 2021)
 

diff --git a/global.go b/global.go
@@ -31,6 +31,7 @@ import (
 )
 
 const (
+	_stdLogDefaultDepth      = 1
 	_loggerWriterDepth       = 2
 	_programmerErrorTemplate = "You've found a bug in zap! Please file a bug at " +
 		"https://github.com/uber-go/zap/issues/new and reference this error: %v"

diff --git a/global_go112.go b/global_go112.go
diff --git a/global_prego112.go b/global_prego112.go