readme: update formatting, add infor about release

Signed-off-by: Jakub Sokołowski <jakub@status.im>

README.md

@@ -4,32 +4,38 @@ SSHFP Tool is a tool created in Golang to glue Consul DB and Cloudflare.
 
 Main purpose is creating SSHFP records to get rid of "host key verification failed".
 
-## Building
+# Building
 
+```sh
+make
 ```
-go mod -vendor
-go build -mod vendor
+Or to build for all platforms
+```sh
+make release
 ```
 
-## Usage
+# Usage
 
 Supported env variables:
-`DOMAIN_NAME` - Domain name which will be working on
-`CF_TOKEN` - CloudFlare Token with write access to above domain
-`HOST_LIVENESS_TIMEOUT` - number in seconds after which host is 
-considered as removed and dns records can be deleted
 
-It's possible to create json formatted config file (example in `testcfg`)
+* `DOMAIN_NAME` - Domain name which will be working on.
+* `CF_TOKEN` - CloudFlare Token with write access to above domain.
+* `HOST_LIVENESS_TIMEOUT` - After this number of seconds of host being offline DNS records are removed.
 
-As it has been designed to work with `consul watches` passing proper .json file
-to STDIN is required. Ex:
-`cat watches.dump | ./sshfp-updater`
+It's possible to create JSON formatted config file (example in `testcfg`)
+
+As it has been designed to work with `consul watches` passing proper JSON file to `stdin` is required.
+```sh
+cat watches.dump | ./sshfp-updater
+```
+
+# Current state
 
-## Current state
 - CloudFlare integration is fully implemented
 - SSHFP Record creation based on tag in Consul form.
 - Implemented Consul watches integration
 - Implemented logic to manipulate states (merging config, etc)
 
-## TODO:
+# TODO
+
 - A few major changes