Use small HTTP dependency (#110)

Replace request with teeny-request. Improve startup time by 400 ms.

request is a large module because it has so many options and features. That
requires both extra bandwidth and space, and also extra time to load and
parse the module every time codecov is run.

Uploading the reports only uses a minimal subset of request's features.
request can easily be switched out with a much more lightweight dependency.

lib/codecov.js

@@ -1,6 +1,6 @@
 var fs = require('fs')
 var path = require('path')
-var request = require('request')
+var request = require('teeny-request').teenyRequest
 var urlgrey = require('urlgrey')
 var jsYaml = require('js-yaml')
 var walk = require('ignore-walk')
@@ -146,11 +146,12 @@ var sendToCodecovV2 = function(
   on_failure
 ) {
   // Direct to Codecov
-  request.post(
+  request(
     {
-      url: urlgrey(codecov_endpoint + '/upload/v2')
+      uri: urlgrey(codecov_endpoint + '/upload/v2')
         .query(query)
         .toString(),
+      method: 'POST',
       body: upload_body,
       headers: {
         'Content-Type': 'text/plain',
@@ -180,11 +181,12 @@ var sendToCodecovV3 = function(
   on_failure
 ) {
   // Direct to S3
-  request.post(
+  request(
     {
-      url: urlgrey(codecov_endpoint + '/upload/v4')
+      uri: urlgrey(codecov_endpoint + '/upload/v4')
         .query(query)
         .toString(),
+      method: 'POST',
       body: '',
       headers: {
         'Content-Type': 'text/plain',
@@ -202,9 +204,10 @@ var sendToCodecovV3 = function(
         )
       } else {
         var codecov_report_url = result.split('\n')[0]
-        request.put(
+        request(
           {
-            url: result.split('\n')[1],
+            uri: result.split('\n')[1],
+            method: 'PUT',
             body: upload_body,
             headers: {
               'Content-Type': 'text/plain',
@@ -299,8 +302,9 @@ var upload = function(args, on_success, on_failure) {
 
   var yamlToken
   try {
-    var loadedYamlFile  = jsYaml.safeLoad(fs.readFileSync(query.yaml, 'utf8'))
-    yamlToken = loadedYamlFile && loadedYamlFile.codecov && loadedYamlFile.codecov.token
+    var loadedYamlFile = jsYaml.safeLoad(fs.readFileSync(query.yaml, 'utf8'))
+    yamlToken =
+      loadedYamlFile && loadedYamlFile.codecov && loadedYamlFile.codecov.token
   } catch (e) {
     // silently fail
   }