Bump https-proxy-agent from 2.2.2 to 2.2.4

Bumps [https-proxy-agent](https://github.com/TooTallNate/node-https-proxy-agent) from 2.2.2 to 2.2.4.
- [Release notes](https://github.com/TooTallNate/node-https-proxy-agent/releases)
- [Commits](https://github.com/TooTallNate/node-https-proxy-agent/compare/2.2.2...2.2.4)

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -890,7 +890,7 @@
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-      "resolved": "http://registry.npmjs.org/@types/node/-/node-8.9.5.tgz",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.9.5.tgz",
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@@ -1155,15 +1155,6 @@
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@@ -1769,7 +1760,7 @@
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-          "resolved": "http://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
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@@ -3983,7 +3974,7 @@
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-          "resolved": "http://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
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           "dev": true,
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@@ -4071,7 +4062,8 @@
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@@ -4092,12 +4084,14 @@
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@@ -4112,17 +4106,20 @@
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@@ -4239,7 +4236,8 @@
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@@ -4251,6 +4249,7 @@
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@@ -4265,6 +4264,7 @@
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@@ -4272,12 +4272,14 @@
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@@ -4296,6 +4298,7 @@
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@@ -4357,7 +4360,8 @@
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@@ -4385,7 +4389,8 @@
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@@ -4397,6 +4402,7 @@
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@@ -4474,7 +4480,8 @@
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@@ -4510,6 +4517,7 @@
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@@ -4529,6 +4537,7 @@
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@@ -4572,12 +4581,14 @@
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@@ -4586,6 +4597,7 @@
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@@ -4635,7 +4647,8 @@
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       "integrity": "sha1-uWjGsKBDhDJJAui/Gl3zJXmkUP4=",
-      "dev": true
+      "dev": true,
+      "optional": true
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@@ -5079,15 +5092,24 @@
       "dev": true
     },
     "https-proxy-agent": {
-      "version": "2.2.1",
+      "version": "2.2.4",
-      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-2.2.1.tgz",
+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-2.2.4.tgz",
-      "integrity": "sha512-HPCTS1LW51bcyMYbxUIOO4HEOlQ1/1qRaFWcyxvwaqUS9TY88aoEuHUY33kuAh1YhVVaDQhLZsnPd+XNARWZlQ==",
+      "integrity": "sha512-OmvfoQ53WLjtA9HeYP9RNrWMJzzAz1JGaSFr1nijg0PVR1JaD/xbJq1mdEIIlxGpXp9eSe/O2LgU9DJmTPd0Eg==",
       "dev": true,
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-        "agent-base": "^4.1.0",
+        "agent-base": "^4.3.0",
         "debug": "^3.1.0"
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+          "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
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@@ -5098,9 +5120,9 @@
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@@ -5650,7 +5672,8 @@
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@@ -6094,7 +6117,7 @@
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@@ -6106,7 +6129,7 @@
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@@ -6310,6 +6333,7 @@
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@@ -6322,7 +6346,8 @@
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@@ -6692,7 +6718,7 @@
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@@ -7930,7 +7956,7 @@
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@@ -8184,6 +8211,7 @@
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@@ -8194,7 +8222,8 @@
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@@ -8213,6 +8243,7 @@
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@@ -8223,6 +8254,7 @@
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@@ -9522,6 +9554,7 @@
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       "dev": true,
+      "optional": true,
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