Go 1.15 and later required, qax-os#65 fn: IMABS, IMCOS, IMCOSH, IMCOT, IMCSC, IMCSCH, IMEXP, IMLN and IMLOG10

Author: xuri

.travis.yml

@@ -4,10 +4,6 @@ install:
   - go get -d -t -v ./... && go build -v ./...
 
 go:
-  - 1.11.x
-  - 1.12.x
-  - 1.13.x
-  - 1.14.x
   - 1.15.x
   - 1.16.x
 

README.md

@@ -13,7 +13,7 @@
 
 ## Introduction
 
-Excelize is a library written in pure Go providing a set of functions that allow you to write to and read from XLSX / XLSM / XLTM files. Supports reading and writing spreadsheet documents generated by Microsoft Excel™ 2007 and later. Supports complex components by high compatibility, and provided streaming API for generating or reading data from a worksheet with huge amounts of data. This library needs Go version 1.10 or later. The full API docs can be seen using go's built-in documentation tool, or online at [go.dev](https://pkg.go.dev/github.com/360EntSecGroup-Skylar/excelize/v2?tab=doc) and [docs reference](https://xuri.me/excelize/).
+Excelize is a library written in pure Go providing a set of functions that allow you to write to and read from XLSX / XLSM / XLTM files. Supports reading and writing spreadsheet documents generated by Microsoft Excel™ 2007 and later. Supports complex components by high compatibility, and provided streaming API for generating or reading data from a worksheet with huge amounts of data. This library needs Go version 1.15 or later. The full API docs can be seen using go's built-in documentation tool, or online at [go.dev](https://pkg.go.dev/github.com/360EntSecGroup-Skylar/excelize/v2?tab=doc) and [docs reference](https://xuri.me/excelize/).
 
 ## Basic Usage