upgrade decimal (#92)

* synchronous tidb decimal.go

* add NewDecFromString and NewDecFromFloat

* upgrade go version from 1.13 to 1.16

Author: luky116

.github/workflows/github-actions.yml

@@ -19,7 +19,7 @@ jobs:
         os:
           - ubuntu-latest
         go_version:
-          - 1.15
+          - 1.16
     env:
       DING_TOKEN: ${{ secrets.DING_TOKEN }}
       DING_SIGN: ${{ secrets.DING_SIGN }}

.golangci.yml

@@ -53,6 +53,6 @@ issues:
 # golangci.com configuration
 # https://github.com/golangci/golangci/wiki/Configuration
 service:
-  golangci-lint-version: 1.15.x # use the fixed version to not introduce new linters unexpectedly
+  golangci-lint-version: 1.16.x # use the fixed version to not introduce new linters unexpectedly
   prepare:
     - echo "here I can run custom commands, but no preparation needed for this repo"

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 
 go:
-  - "1.15.x"
+  - "1.16.x"
 
 script:
   - go fmt ./... && [[ -z `git status -s` ]]

go.mod

@@ -1,5 +1,7 @@
 module github.com/dubbogo/gost
 
+go 1.16
+
 require (
 	github.com/buger/jsonparser v1.1.1
 	github.com/davecgh/go-spew v1.1.1
@@ -30,4 +32,3 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )
 
-go 1.13