curl: Update version from 7.52.1 to 7.54.0

[Changes][1]:

> ### 7.53.0 - February 22 2017 ###
>
> *   unix_socket: added --abstract-unix-socket and
>     CURLOPT_ABSTRACT_UNIX_SOCKET
> *   CURLOPT_BUFFERSIZE: support enlarging receive buffer

> ### 7.54.0 - April 19 2017 ###
>
> *   Add CURL_SSLVERSION_MAX_* constants to CURLOPT_SSLVERSION
> *   Add --max-tls
> *   Add CURLOPT_SUPPRESS_CONNECT_HEADERS
> *   Add --suppress-connect-headers

As nghttp2 is now installed, and detected by curl, HTTP/2 support is
enabled now.

```
HTTP2 support:    enabled (nghttp2)
```

```
$ curl --version
curl 7.54.0 (x86_64-pc-linux-gnu) libcurl/7.54.0 OpenSSL/1.0.2j zlib/1.2.5 nghttp2/1.23.1
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
Features: IPv6 Largefile NTLM NTLM_WB SSL libz TLS-SRP HTTP2 UnixSockets HTTPS-proxy
```

[1]: https://curl.haxx.se/changes.html

curl.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION curl-7.52.1-0
+# BEE_VERSION curl-7.54.0-0
 
 BEE_BUILDTYPE='autotools'