fix(acme) bump lua-resty-acme to get better error handling (#17)

update readme to avoid confusion with plugin config

README.md

@@ -37,7 +37,8 @@ $ curl http://localhost:8001/plugins \
         -d name=acme \
         -d [email protected] \
         -d config.tos_accepted=true \
-        -d config.domains[]=my.secret.domains.com
+        -d config.domains[]=my.secret.domains.com \
+        -d config.domains[]=my.anoother.secret.domains.com
 ```
 
 Note by setting `tos_accepted` to *true* implies that you have read and accepted
@@ -65,7 +66,7 @@ $ curl https://mydomain.com
 Name                | Required   | Default | Description
 -------------------:|------------|------------|------------
 config.account_email| Yes        |            | The account identifier, can be reused in different plugin instance.
-config.api_uri      |            |  `"https://acme-v02.api.letsencrypt.org"`   | The ACMEv2 API endpoint to use, user might use [Let's Encrypt staging environemnt](https://letsencrypt.org/docs/staging-environment/) during testing. Kong doesn't automatically delete staging certificates, if you use same domain to test and use in production, you will need to delete those certificates manaully after test.
+config.api_uri      |            |  `"https://acme-v02.api.letsencrypt.org"`   | The ACMEv2 API endpoint to use, the url should only contain root path. User might use [Let's Encrypt staging environemnt](https://letsencrypt.org/docs/staging-environment/)(`https://acme-staging-v02.api.letsencrypt.org`) during testing. Kong doesn't automatically delete staging certificates, if you use same domain to test and use in production, you will need to delete those certificates manaully after test.
 config.cert_type    |            |  `"rsa"`   | The certificate type to create, choice of `"rsa"` for RSA certificate or `"ecc"` for EC certificate.
 config.domains      |            | `[]`       | The list of domains to create certificate for. To match subdomains under `example.com`, use `*.example.com`. Regex pattern is not supported. Note this config is only used to match domains, not to specify the Common Name or Subject Alternative Name to create certifcates; each domain will have its own certificate.
 config.renew_threshold_days|     |  `14`      | Days before expire to renew the certificate.

kong-plugin-acme-0.2.2-1.rockspec

@@ -1,5 +1,5 @@
 package = "kong-plugin-acme"
-version = "0.2.2-1"
+version = "0.2.2-2"
 source = {
    url = "git+https://github.com/Kong/kong-plugin-acme.git"
 }
@@ -22,5 +22,5 @@ build = {
 }
 dependencies = {
   --"kong >= 1.2.0",
-  "lua-resty-acme ~> 0.4"
+  "lua-resty-acme ~> 0.5"
 }