embulk update to 0.8.9

gistfile1.txt

% embulk selfupdate
2016-05-14 22:38:24.502 +0900: Embulk v0.8.8
Checking the latest version...
Found new version 0.8.9.
Downloading https://dl.bintray.com/embulk/maven/embulk-0.8.9.jar ...
OpenSSL::SSL::SSLError: certificate verify failed
              connect at org/jruby/ext/openssl/SSLSocket.java:215
     block in connect at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/net/http.rb:927
              timeout at org/jruby/ext/timeout/Timeout.java:127
              connect at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/net/http.rb:927
             do_start at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/net/http.rb:867
                start at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/net/http.rb:856
            open_http at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/open-uri.rb:318
          buffer_open at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/open-uri.rb:736
   block in open_loop at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/open-uri.rb:211
                catch at org/jruby/RubyKernel.java:1096
            open_loop at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/open-uri.rb:209
             open_uri at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/open-uri.rb:150
  block in selfupdate at /home/yoshikaw/.embulk/bin/embulk!/embulk/command/embulk_selfupdate.rb:56
                 open at org/jruby/RubyIO.java:1124
           selfupdate at /home/yoshikaw/.embulk/bin/embulk!/embulk/command/embulk_selfupdate.rb:54
                  run at /home/yoshikaw/.embulk/bin/embulk!/embulk/command/embulk_run.rb:283
                <top> at /home/yoshikaw/.embulk/bin/embulk!/embulk/command/embulk_main.rb:2
              require at org/jruby/RubyKernel.java:937
               (root) at uri:classloader:/META-INF/jruby.home/lib/ruby/stdlib/rubygems/core_ext/kernel_require.rb:1
                <top> at file:/home/yoshikaw/.embulk/bin/embulk!/embulk/command/embulk_bundle.rb:51

gistfile2.txt

% curl --create-dirs -o ~/.embulk/bin/embulk -L "http://dl.embulk.org/embulk-latest.jar"
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

gistfile3.txt

% curl --insecure --create-dirs -o ~/.embulk/bin/embulk -L "http://dl.embulk.org/embulk-latest.jar"