Remove Gemfile.lock from ssh_scan as it's too restrictive to those that use it

Gemfile.lock

@@ -1,88 +0,0 @@
-PATH
-  remote: .
-  specs:
-    ssh_scan (0.0.34)
-      bindata (= 2.4.3)
-      net-ssh (= 4.2.0)
-      netaddr (= 1.5.1)
-      sshkey
-
-GEM
-  remote: https://rubygems.org/
-  specs:
-    ast (2.4.0)
-    bindata (2.4.3)
-    coderay (1.1.2)
-    coveralls (0.8.21)
-      json (>= 1.8, < 3)
-      simplecov (~> 0.14.1)
-      term-ansicolor (~> 1.3)
-      thor (~> 0.19.4)
-      tins (~> 1.6)
-    diff-lcs (1.3)
-    docile (1.1.5)
-    jaro_winkler (1.5.1)
-    json (2.1.0)
-    method_source (0.9.0)
-    net-ssh (4.2.0)
-    netaddr (1.5.1)
-    parallel (1.12.1)
-    parser (2.5.1.0)
-      ast (~> 2.4.0)
-    powerpack (0.1.2)
-    pry (0.11.3)
-      coderay (~> 1.1.0)
-      method_source (~> 0.9.0)
-    rainbow (3.0.0)
-    rake (12.3.1)
-    rspec (3.7.0)
-      rspec-core (~> 3.7.0)
-      rspec-expectations (~> 3.7.0)
-      rspec-mocks (~> 3.7.0)
-    rspec-core (3.7.1)
-      rspec-support (~> 3.7.0)
-    rspec-expectations (3.7.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-its (1.2.0)
-      rspec-core (>= 3.0.0)
-      rspec-expectations (>= 3.0.0)
-    rspec-mocks (3.7.0)
-      diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.7.0)
-    rspec-support (3.7.1)
-    rubocop (0.57.2)
-      jaro_winkler (~> 1.5.1)
-      parallel (~> 1.10)
-      parser (>= 2.5)
-      powerpack (~> 0.1)
-      rainbow (>= 2.2.2, < 4.0)
-      ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-progressbar (1.9.0)
-    simplecov (0.14.1)
-      docile (~> 1.1.0)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.2)
-    sshkey (1.9.0)
-    term-ansicolor (1.6.0)
-      tins (~> 1.0)
-    thor (0.19.4)
-    tins (1.16.3)
-    unicode-display_width (1.4.0)
-
-PLATFORMS
-  ruby
-
-DEPENDENCIES
-  coveralls
-  pry (= 0.11.3)
-  rake (= 12.3.1)
-  rspec (= 3.7.0)
-  rspec-its (= 1.2.0)
-  rubocop
-  ssh_scan!
-
-BUNDLED WITH
-   1.16.2