txn: have header.add() populate header_decoded too

[codecov[bot]]

Codecov Report

Merging #35 into master will increase coverage by 0.42%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #35      +/-   ##
=========================================
+ Coverage   54.27%   54.7%   +0.42%     
=========================================
  Files           9       9              
  Lines         444     446       +2     
  Branches       92      93       +1     
=========================================
+ Hits          241     244       +3     
+ Misses        203     202       -1

Impacted Files	Coverage Δ
lib/transaction.js	37% <100%> (+1.8%)	:arrow_up:

---

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[msimerson]

$ npm publish
npm notice 
npm notice 📦  haraka-test-fixtures@1.0.27
npm notice === Tarball Contents === 
npm notice 1.0kB package.json                              
npm notice 138B  .codeclimate.yml                          
npm notice 191B  .eslintrc.json                            
npm notice 235B  .travis.yml                               
npm notice 389B  appveyor.yml                              
npm notice 2.0kB Changes.md                                
npm notice 520B  index.js                                  
npm notice 1.1kB LICENSE                                   
npm notice 1.5kB README.md                                 
npm notice 722B  run_tests                                 
npm notice 1.9kB lib/connection.js                         
npm notice 421B  lib/line_socket.js                        
npm notice 1.8kB lib/logger.js                             
npm notice 6.4kB lib/plugin.js                             
npm notice 439B  lib/stub.js                               
npm notice 7.0kB lib/transaction.js                        
npm notice 5.0kB lib/util_hmailitem.js                     
npm notice 2.0kB lib/vm_harness.js                         
npm notice 1.8kB test/connection.js                        
npm notice 81B   test/fixtures/mock-plugin-dir/index.js    
npm notice 235B  test/fixtures/mock-plugin-dir/package.json
npm notice 121B  test/fixtures/mock-plugin.js              
npm notice 1.7kB test/index.js                             
npm notice 742B  test/logger.js                            
npm notice 2.0kB test/plugin.js                            
npm notice 649B  test/stub.js                              
npm notice 2.3kB test/transaction.js                       
npm notice 564B  test/vm_harness.js                        
npm notice === Tarball Details === 
npm notice name:          haraka-test-fixtures                    
npm notice version:       1.0.27                                  
npm notice package size:  12.2 kB                                 
npm notice unpacked size: 42.9 kB                                 
npm notice shasum:        545a62bc74df456bfc130d017eb86829f8b54769
npm notice integrity:     sha512-uj0xOt9L99ORU[...]S0XqajOfFnMFg==
npm notice total files:   28                                      
npm notice 
+ haraka-test-fixtures@1.0.27