GODRIVER-2174 Bump minimum Go version to 1.13. (mongodb#1100)

Co-authored-by: Matt Dale <9760375+matthewdale@users.noreply.github.com>

.evergreen/config.yml

@@ -1799,13 +1799,15 @@ tasks:
         vars:
           MONGO_GO_DRIVER_COMPRESSOR: "snappy"
 
-  - name: go1.10-build
+  - name: go1.13-build
     tags: ["compile-check"]
     commands:
       - func: run-make
         vars:
           targets: "build"
-          BUILD_ENV: "PATH=/opt/golang/go1.10/bin:$PATH GOROOT=/opt/golang/go1.10"
+          # Use GO111MODULE=off to disable modules, as go versions less than
+          # 1.16 will complain about the retract directives in go.mod.
+          BUILD_ENV: "GO111MODULE=off PATH=/opt/golang/go1.13/bin:$PATH GOROOT=/opt/golang/go1.13"
 
   # Build with whatever the latest Go version is that we're using for tests
   - name: build

CONTRIBUTING.md

@@ -13,7 +13,7 @@ Before starting to write code, look for existing [tickets](https://jira.mongodb.
 The Go Driver team uses GitHub to manage and review all code changes. Patches should generally be made against the master (default) branch and include relevant tests, if
 applicable.
 
-Code should compile and tests should pass under all Go versions which the driver currently supports. Currently the Go Driver supports a minimum version of Go 1.10 and requires Go 1.17 for development. Please run the following Make targets to validate your changes:
+Code should compile and tests should pass under all Go versions which the driver currently supports. Currently the Go Driver supports a minimum version of Go 1.13 and requires Go 1.18 for development. Please run the following Make targets to validate your changes:
 - `make fmt`
 - `make lint` (requires [golangci-lint](https://github.com/golangci/golangci-lint) and [lll](https://github.com/walle/lll) to be installed and available in the `PATH`)
 - `make test`

README.md

@@ -22,8 +22,9 @@ The MongoDB supported driver for Go.
 -------------------------
 ## Requirements
 
-- Go 1.10 or higher if using the driver as a dependency. Go 1.17 or higher if building the driver yourself. We aim to support the latest versions of Go.
-- MongoDB 2.6 and higher.
+- Go 1.13 or higher. We aim to support the latest versions of Go.
+  - Go 1.18 or higher is required to run the driver test suite.
+- MongoDB 3.6 and higher.
 
 -------------------------
 ## Installation

go.mod

@@ -1,6 +1,6 @@
 module go.mongodb.org/mongo-driver
 
-go 1.10
+go 1.13
 
 retract (
 	[v1.7.0, v1.7.1] // Contains data race bug in background connection establishment.