Update speaker info

source/_speakers/dan-mcnamara.md

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+---
+name: Dan McNamara
+role: Managing Director
+organisation: Microserve
+image: dan-mcnamara.jpg
+links:
+  twitter: DanMcN
+use:
+  - sessions
+---

source/_speakers/matt-haworth.md

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+---
+name: Matt Haworth
+role: Co-Founder
+organisation: Reason Digital
+image: matt-haworth.jpg
+links:
+  twitter: ~
+use:
+  - sessions
+---

source/_speakers/tom-metcalfe.md

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----
-name: Tom Metcalfe
-organisation: Reason Digital
-image: tom.jpg
-links:
-  twitter: tommymets9
-use:
-  - sessions
----
-Some stuff about Tom.