switch from dep to mod

vendor/github.com/certifi/gocertifi/README.md

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+# GoCertifi: SSL Certificates for Golang
+
+This Go package contains a CA bundle that you can reference in your Go code.
+This is useful for systems that do not have CA bundles that Golang can find
+itself, or where a uniform set of CAs is valuable.
+
+This is the same CA bundle that ships with the
+[Python Requests](https://github.com/kennethreitz/requests) library, and is a
+Golang specific port of [certifi](https://github.com/kennethreitz/certifi). The
+CA bundle is derived from Mozilla's canonical set.
+
+## Usage
+
+You can use the `gocertifi` package as follows:
+
+```go
+import "github.com/certifi/gocertifi"
+
+cert_pool, err := gocertifi.CACerts()
+```
+
+You can use the returned `*x509.CertPool` as part of an HTTP transport, for example:
+
+```go
+import (
+  "net/http"
+  "crypto/tls"
+)
+
+// Setup an HTTP client with a custom transport
+transport := &http.Transport{
+	TLSClientConfig: &tls.Config{RootCAs: cert_pool},
+}
+client := &http.Client{Transport: transport}
+
+// Make an HTTP request using our custom transport
+resp, err := client.Get("https://example.com")
+```
+
+## Detailed Documentation
+
+Import as follows:
+
+```go
+import "github.com/certifi/gocertifi"
+```
+
+### Errors
+
+```go
+var ErrParseFailed = errors.New("gocertifi: error when parsing certificates")
+```
+
+### Functions
+
+```go
+func CACerts() (*x509.CertPool, error)
+```
+CACerts builds an X.509 certificate pool containing the Mozilla CA Certificate
+bundle. Returns nil on error along with an appropriate error code.

vendor/github.com/certifi/gocertifi/tasks.py

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+from invoke import task
+import requests
+
+@task
+def update(ctx):
+    r = requests.get('https://mkcert.org/generate/')
+    r.raise_for_status()
+    certs = r.content
+
+    with open('certifi.go', 'rb') as f:
+        file = f.read()
+
+    file = file.split('`\n')
+    assert len(file) == 3
+    file[1] = certs
+
+    ctx.run("rm certifi.go")
+
+    with open('certifi.go', 'wb') as f:
+        f.write('`\n'.join(file))