fix: add new SSL certificate (#432)

When running the tests I got errors like this:

    Error: error:140AB18E:SSL routines:SSL_CTX_use_certificate:ca md too weak

In order to fix this I created a new certificate. I thought 100 years of
validity might be enough. The command to create it was (based on
https://letsencrypt.org/docs/certificates-for-localhost/):

    openssl req -x509 -out cert.pem -keyout privkey.pem \
      -newkey rsa:2048 -nodes -sha256 \
      -subj '/CN=localhost' -extensions EXT -config <( \
       printf "[dn]\nCN=localhost\n[req]\ndistinguished_name = dn\n[EXT]\nsubjectAltName=DNS:localhost\nkeyUsage=digitalSignature\nextendedKeyUsage=serverAuth") \
      -days 36524

To verify, run from within *js-ipfs*:

    npx mocha test/core/interface.spec.js --grep 'should add from a HTTPS URL'

js/test/fixtures/ssl/cert.pem

@@ -1,20 +1,18 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

js/test/fixtures/ssl/privkey.pem

@@ -1,27 +1,28 @@
------BEGIN RSA PRIVATE KEY-----
-MIIEogIBAAKCAQEA6x6mTXV+rC35QW/sPutT1O1cugtnw+UsJx7EGgzyjh7EoXE3
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-3991i8J98DZ9zqmkxJJhGwstCHG+c+Q7lA6kZ1UdbWJwYwIHjAs=
------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----
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+-----END PRIVATE KEY-----