Fix required node version and missed npm package (#485)

* Fix: upgrade node to v10.15.0 as it required by npm modules
* Fix: add http-signature to package.json

Author: dapi

.nvmrc

@@ -1 +1 @@
-v10.11.0
+v10.15.0

package.json

@@ -23,6 +23,7 @@
     "bootstrap": "^4.3.1",
     "compression-webpack-plugin": "^3.0.1",
     "history": "^4.7.2",
+    "http-signature": "^1.3.5",
     "i18n-iso-countries": "^3.7.8",
     "immutability-helper": "^3.0.0",
     "javascript-obfuscator": "^2.6.1",

yarn.lock

@@ -6500,13 +6500,18 @@ http-proxy@^1.17.0:
     follow-redirects "^1.0.0"
     requires-port "^1.0.0"
 
-http-signature@~1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/http-signature/-/http-signature-1.2.0.tgz#9aecd925114772f3d95b65a60abb8f7c18fbace1"
+http-signature@^1.3.5:
+  version "1.3.5"
+  resolved "https://registry.yarnpkg.com/http-signature/-/http-signature-1.3.5.tgz#9f19496ffbf3227298d7b5f156e0e1a948678683"
+  integrity sha512-NwoTQYSJoFt34jSBbwzDHDofoA61NGXzu6wXh95o1Ry62EnmKjXb/nR/RknLeZ3G/uGwrlKNY2z7uPt+Cdl7Tw==
   dependencies:
     assert-plus "^1.0.0"
     jsprim "^1.2.2"
-    sshpk "^1.7.0"
+    sshpk "^1.14.1"
+
+http-signature@~1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/http-signature/-/http-signature-1.2.0.tgz#9aecd925114772f3d95b65a60abb8f7c18fbace1"
 
 https-browserify@^1.0.0:
   version "1.0.0"
@@ -12045,7 +12050,7 @@ ssh-config@^1.1.1:
   version "1.1.6"
   resolved "https://registry.yarnpkg.com/ssh-config/-/ssh-config-1.1.6.tgz#c6ce2d7f85f395178c9e47c448d62b8adf9b2523"
 
-sshpk@^1.7.0:
+sshpk@^1.14.1, sshpk@^1.7.0:
   version "1.16.1"
   resolved "https://registry.yarnpkg.com/sshpk/-/sshpk-1.16.1.tgz#fb661c0bef29b39db40769ee39fa70093d6f6877"
   dependencies: